-Simmons-
There was no cure.
Fitz wouldn't accept it, but she knew the plane would explode if she stayed. He was the only one here still working to find a cure. Keyword: was. She hit him over the head so he wouldn't try to stop her.
Jemma was going to jump, and Fitz wasn't going to stop her.
The door of the plane is open. Simmons is standing at the edge. And Fitz wakes up.
He's yelling her name. She turns to look back at him. A phrase she's always wanted to confess to her partner plays at the edge of her tongue. Jemma begins to say the three dreaded words every scientist fears when the wind sucks her into oblivion, carrying the simple sentence "I love you" with it.
-Fitz-
This is impossible. There's no way Simmons was dead. They've been together for so long; with her gone, he felt a significant part of him was missing.
Ward had jumped after Jemma just to make sure... He hadn't even found her body.
"Fitz," Coulson says gently, approaching the rocket scientist. "We're going to have to move you to a confined area. It's been a shock to your system, what happened to Jemma, and we don't want any more accidents."
When he doesn't move Skye drags him by the arm away from the lab. Their lab. Fitz couldn't speak through his gut-wrenching sobs. They walked in almost absolute silence, save for the sounds of violent crying.
"I- I love her." He finally chokes out.
"I know." Skye replies, leading him into a room with no windows. "I'll be back, I just need to check with Coulson about something." It was clear she was close to tears as well.
After Skye locks the door behind her and walks away, Fitz pulls out a small vial from his pocket. A teaspoon of this stuff kills instantly. He had pocketed it before Skye pulled him away. There was only one way this day was going to end for Fitz, and that wasn't in temporary sleep. No, he needed something permanent. He needed to be with Jemma.
Fitz uncorks the vial the minute Ward opens the door. He looks at his colleague in alarm, then eyes the vial of poison. "Fitz-" he starts, but is cut off.
"Don't! Don't try and tell me I shouldn't do it, that it'll all be alright someday. Because it won't! It never will be!" He yells, backing into a corner.
Ward slowly puts his hands up, walking towards him. "I was never going to say that. I know nothing will be the same without Jemma. It's terrible, and I can't stop you from doing anything. Just please, consider all your options here."
Fitz stares at Ward, then at the poison. His tears had almost dried. He wasn't afraid anymore. Finally, after a few precious moments of deliberation, Fitz makes his last official statement. "I'll be with her. Like I should be. I'm sorry." With that, he gulps the small amount of liquid in the vial and drops to the floor a second later, his pulse having stopped for good.