Hiccup gaped at the sight before him, his heartbeat slowing down, fists curling and eyes filling up with animosity.

Heather and the man in bed with her, the man who was not him, yelped and drew the sheets up for cover.

"Hiccup, I can explain," Heather started, attempting to decipher an innocent look but failing hard. She instead came across as rather unapologetic and almost proud of herself.

Hiccup snorted. "Okay.. explain then," he seethed, folding his arms to calm himself down.

Heather exhaled. "It's hard for me to stay committed to one person for too long, you know that. But I didn't want to break up with you.."

Hiccup shot her an incredulous look. "So you opted to cheat on me instead? How thoughtful of you!" he retorted dryly.

The guy next to Heather started getting up to dress himself. Heather and Hiccup paid him no heed, too caught up in their little "confrontation" to take much notice of anything else.

"Hiccup, I told you before we got together that I might get bored of you. Don't try to act like I didn't warn you," she reminded him with a smile. "Besides, I actually did this to save our relationship!"

Hiccup threw his hands dramatically in the air. "How in the world does this save our relationship?"

Heather shrugged. "It makes me appreciate you more."

"That makes.. no sense," he sighed.

"It kinda makes sense," the nameless guy interrupted. "I went behind my wife's back for years and eventually she is the one who started to feel like the other woman. I loved it!"

Hiccup quirked an eyebrow. "And did your wife feel the same way?"

"Nahh, she divorced my ass once she found out, but it was still worth it! I'm here with your girl now, aren't I? That gotta count for something."

Heather smiled. "Exactly what Ted said."

Hiccup shook his head in bewilderment. "Okay, let us pretend I understand where you are going with this for a moment.. tell me, just how many other guys have you slept with over the course of our relationship?"

Heather pretended to think for a moment. "There was this bulky, hot guy Eret. His British accent melted my panties off. Then there was your cousin Steve and one time I hooked up with your best friend Fred in the back of our car."

Hiccup curled his fists in anger. Heather could only smirk. "C'mon Hiccup! Just try to imagine me fucking all those guys.. how does that make you feel? Does it make you feel furious? Possessive? Maybe even a little bit.. turned on?"

"Go for it dude!" Ted cheered him on. "If you don't, I might as well volunteer."

Hiccup backed away. "This.. This has to be a bad dream," he trailed off, feeling sick to his stomach. "I just can't... I had real feelings for you, Heather! I loved you! But you...you just want to play mind-games and cheapen our relationship like this.."

Heather rolled her eyes. "Oh don't be so dramatic, you dumbass. I loved you too! It's not my fault that you are so self-absorbed and apathetic all the time. It's impossible to get through you, it's like you are a million miles away. I was trying to rile you up and make you feel jealous so you would pay me some attention for once! I was trying to get some kind of reaction out of you because God you are so boring and dull," she explained.

Hiccup blinked. "Wait... so you didn't cheat on me?"

Heather shook her head. "Only because you forced me to."

"I'm confused," Hiccup deflated. "Did you or did you not have sex with Eret, Snotlout, Fishlegs and this shirtless-" he gestured at the unwanted third party in the room. "-guy I have never seen before?"

Heather sighed. "What does it matter? It's not the point I'm trying to make!"

"The point being?"

Heather groaned. "Are you angry? Are your instincts screaming at you to mark me as your own?"

Hiccup didn't respond for a while but then shrugged. "Not really," he admitted.

It happened to be the wrong answer as he was suddenly met with Heather's elbow right in his ribs. "You are not a real man then. Maybe you are gay or something, that would explain a few things."

Hiccup let out a humorless laugh. "Yeah.. that must be it."

"Get out," Heather smiled a sickeningly sweet smile. "Only come back to me after you have figured out how to act like a real man and not some "pushover" beta male with no backbone or integrity."

"How am I not a "pushover beta male" if I take you back after you cheated on me?" Hiccup defended himself. "It's like no matter what, I'm the loser here."

"Get out," Heather simply repeated. Hiccup didn't need to be told thrice. Throwing the door open, he rushing outside and into the cold night. He felt like he had stepped into some kind of twilight zone. He always knew Heather was a bit fickle and easily bored but this was just absurd.

Or was it?

Was Heather right after all? Was he really what she had described? If so, how could he improve himself so he will be good enough for her. Good enough that she will not need to seek out other men to fulfill her needs.

Hiccup dug out his phone and dialed up the only person he could think of.

AN: The reason I chose Heather as the girlfriend is because I can't imagine Astrid cheating on Hiccup since her character is all about staying loyal, truthful and honest. Heather however has shown to be restless, is prone to lying and deceiving others, and always puts her own interest first. So if I have to imagine any girl from HTTYD as a cheater, Heather makes the best fit.

This is going to be a Camicazi/Hiccup story. Cami makes an appearance in the next chapter.