I think it's time for a flashback, because you need to see how bad it got. This takes place between "Suicide Squad" and "Birds of Prey."

Fighting seemed to be the only way Felicity could get Oliver to talk to her anymore. He was always short with his answers and avoided eye contact, but at least he talked to her. In the beginning he was at the office so much with Jensen as his EA and that wicked velociraptor Rochev. But even after Felicity pushed her way into the EA position (she knew he needed her, and Rochev would surely try to get her claws in him) it was like he was afraid to be around her. Like looking at her brought up only bad memories.

But she endured. Even when Sara's bold presence made her feel insecure. Even when she saw Oliver speaking with Rochev. Even though she was the ghost of the woman he married, with her natural brown hair streaked with stress-induced gray. Felicity would look at her ring and tell herself everything would be fine.

Being friends with Barry had helped, however brief that was. And she had Thea, Laurel, Sara (sort of), very protective Roy (who had his own problems to deal with) and of course Diggle. And Moira. Moira helped so much. She knew well what she was feeling and taught her how to be strong. How to be Mrs. Queen.

So despite the nightmares and changelings and ransom schemes and slander and everything else, she thought that she might eventually be okay.

But still, a girl can only take so much.

"You are being way too harsh on her." Felicity asserted. She and Oliver were alone in the lair, exactly how he didn't prefer it. She could tell he was itching to leave but she wouldn't let him just yet. "And in some ways a little hypocritical."

"Hypocritical?" He briefly made eye contact. What a victory for her. "She lied. Just like she always does. I can't believe you're defending her."

"How often do you lie? Anyway, think about it. She refuses to tell Thea. And when I tell you because I think you and your mother should tell Thea before she finds out from the wrong source, you get mad at your mom but keep the secret from Thea as well. Honestly, I understand why she kept it until now but if she's running for mayor someone will find out. So better Thea hear it from her family. Anyway, quit being pissed at your mom."

"This is about the fact that I can't trust her." he seethed.

"I know she's a dubious she-devil and I trust her just fine. Oliver, I don't think you understand. She's scared, okay? She's terrified. She just wants to protect you and Thea. And when would have been the right time to tell Thea? Hmm? When? Because it probably would've been terrible if Malcolm had had a chance to be her father. And now? She is the last Merlyn and the city is still thirsty for blood. So maybe you should forgive her reluctance."

He was silent, which made her eager to keep the argument going.

"Does this have to do with the fact that your mother cheated on your father?" Oliver stared at her, and she was grateful for the reaction. "Well your father did it repeatedly, okay? So excuse Moira for losing her self-esteem and falling into the arms of a widower who actually gave a damn about her. She was crushed and lonely and even a little bit worried of how much you might take after him. Being cheated on sucked so you're just going to have to forgive her for having a vulnerable moment."

Oliver looked away uncomfortably, his arms folded. "I'll, uh… I'll consider having a talk with her." Then he kissed her on the cheek, something he hardly ever did, before clanging up the stairs.

Felicity froze in confusion, wondering why that felt so off. It… no, she wasn't going down that road again. No, he married her. That meant something. And he wasn't like that anymore. And not with Sara. Especially not with Sara. Not only did she have a bad history with Oliver, but she'd also bonded with Felicity to a significant degree. So how supremely fucked up would that be? Very supremely fucked up.

Her French-manicured nails clicked on the desk as she resisted the urge to check security footage. But of course what would that yield? She'd told the whole team she was installing cameras, and it was encouraged because she needed to keep busy. So no way would there be anything scandalous on them.

She sat down and woke up the computer, the monitors glowing. It wouldn't hurt to look, now would it? The footage was rewinding at double speed. She was simply curious as to why Oliver and Sara had been giving off a strange vibe lately. It could be nothing.

Or she could find exactly what she'd been afraid of.

How could he have forgotten about the security cameras?

It was looped. She left those incriminating seconds playing on repeat and he, Sara, and Diggle saw it when they entered the lair. Once Diggle understood what he was seeing and why he was seeing it, he very nearly decked him. Very nearly. Sara kept it from happening. There was yelling and half-assed explanations and a few accusations, but all Oliver remembered was a deeply-rooted sense of loss and the feeling that someone had hollowed out his chest had filled it with rocks.

He hurried back to his house on his Ducati. Maybe she was still there. Maybe if she screamed and cried and hit him enough then she wouldn't leave. He was so sorry. He was weak and stupid and he was so sorry.

She wasn't there. His mother was though, wearing the cold glare that Felicity could now imitate flawlessly.

"Where is she?" he growled, hating the look on her face.

She took her time to answer, unfazed by his anger. "I promised not to tell. And I suggest that you don't go looking for her."

"She's my wife! I need to—"

"You need to shut your mouth and listen to me." she demanded, raising her voice as she stepped into his personal space. "You weren't there for Felicity. You busied yourself at the office so you wouldn't have to see your wife in a catatonic state. You wouldn't sleep in the same bed with her because of her night terrors. You can barely look at her anymore let alone talk to her. We are the ones who've been here for her: Diggle, Roy, Thea, Laurel, Detective Lance—even Walter has spent time with her when he visits to work on my campaign. And of course you know how strong my relationship with her is. But where have you been? Where the hell have you been, when you should've been grieving with your wife?"

"Why would she want me anymore?" he barked, then his voice softened until it broke. "I have spent this entire time waiting for her to realize this is all my fault. I don't know what I'm going to do when I look in her eyes and finally see the resentment she deserves to feel toward me."

"Oh, so that's it," Moira said, unmoved. "Well it certainly seems that you went about it the wrong way, now doesn't it?" She sighed. "You self-absorbed brat. That stupid fear of yours does not give you license to betray your already fragile wife. Now I'm about to have a rare moment of pure honesty so I suggest you pay close attention."

Teary-eyed, Oliver lifted his head to look at his mother. "I'm listening."

"You fucked up." she stated. "I don't know when Felicity will come back, if ever. Because she is not just hurt, Oliver. She is furious. If she does come back, I suggest you get on your knees and grovel just in case she plans to kill you. And if you ever cheat on her again, so help me I will avenge her myself."

Oliver was then left to process the magnitude of what he had done and hope there was a way back from it.

"Tusk" by Fleetwood Mac.