Thor Odinson

You had just had a really bad LARP run. Your team had lost, your arms were hurting and all you really wanted to do was get home and cuddle with Thor, knowing that he would be back from Asgard today. When you walked through the door of your apartment your joy at seeing him was quickly crushed when you saw him... kissing Jane.

"Th-Thor?" He abruptly pulled away.

"Lady Y/N!"

"I should probably go," Jane said, heading out the door.

"You better run!" You started chasing her but Thor grabbed your wrist.

"Lady Y/N please listen to me."

"Why should I?! Is this what you've been doing when you tell me you've been in Asgard!? Sneaking around behind my back?"

"It wasn't what it looked like."

"Really? Because it looked like you were kissing her!"

"It wasn't like that."

"Yeah sure," you scoffed. Thor grabbed your other wrist and slammed you against the wall.

"LISTEN TO ME!" he roared.

"Thor, you're hurting me..." you whimpered, tears stinging your eyes. Thor immediately let go.

"My love, I am sorry!"

"Don't call me that!" you seethed. "You know what Thor, you can just leave!" Thor looked at you sadly.

"Very well, Lady Y/N, I shall comply with your wishes." You couldn't even look at him but your heard him open and close the door as he left. Only after he was gone did you allow yourself to cry.

...

Sam Wilson/ Falcon

Recently, Sam had been struggling with PTSD. You knew he suffered from it from his war days but his last mission had severely triggered it. You had been making him go see a shrink and seemed to be helping at first, but then he stopped going. Sam barely even spoke to you. His nightmares seemed to be getting worse and worse. Every time you calmed him, he seemed to have this incredibly guilty look on his face. He was hurting, and it upset you that you couldn't help him. Sam knew this and it just added to his guilt. He couldn't watch you ache over him anymore.

*

One afternoon, you came home from work, brining home some take out.

"Babe? I'm home and I've brought dinner!" you called. No answer. "Sam?" You put the stuff on the table. You went looking for him and called out his name. Returning to the kitchen, you spotted a note taped to the fridge that you hadn't seen when you first walked in. You took it off and read it.

Y/N,

I know I shouldn't be leaving you like this but I can't keep watching you suffer because of me. I don't want you to have to fight my demons too. I'm sorry, you deserve better than me.

Goodbye,

Sam

You read and reread the letter. You couldn't believe it. You tried ringing his phone but it rang right through. You tried a few times, becoming increasingly desperate, unable to believe this was happening. You gave up after a while and called Rhodey.

"Hello?"

"Rhodey! Please tell you've seen Sam."

"No, I haven't. Why? What's happened?"

"Sam broke up with me! He left me a note saying his PTSD was getting to him and he's- he's just gone!" you sobbed, finally realising what was happening.

"Hold on Y/N, I'll be right there."

...

Natasha Romanoff/ Black Widow

S.H.I.E.L.D. was sending Natasha on a dangerous solo mission. The closer it came time for her to leave, the more she started thinking of your relationship. Nat would be facing some dangerous adversaries and she knew what they would do to you if they ever found out. Sure you were strong and could hold your own in a fight, but these people were sneaky. For your own safety, she'd have to end it.

*

A few hours before Nat had to leave for her mission, she sat you down.

"Y/N... I want to break up," she said calmly. You were totally blindsided by this.

"Wha- what? Why? Did I do something wrong?"

"No, Y/N. It's because... I don't love you anymore." Those five words hurt more than anything you ever encountered before and you just went numb.

"I'm sorry Y/N," she said, standing up. "Goodbye." Natasha gave you one final kiss before she left. She was hurting too; she really did love you, and that's why she was doing this. To protect you. For a while, you just sat there staring at the door, trying to make sense of it all before finally breaking down. Not sure what else to do, you texted Clint and asked him to come over. When he arrived, you flung your arms around him sobbing.

"I'm here Y/N. What happened?"

"N-Nat b-b-broke up with me! She-she said she d-didn't l-love me any... more," you hiccoughed. Clint hugged you and rubbed your back.

"I'm so sorry Y/N, but I'm sure she didn't mean it."

"H-how do you know?"

"Nat's a very complex person. I've been her partner for years and I'm still trying to figure her out. Trust me when I say, I've never seen her happier than when she was with you." You calmed slightly at his words. Clint stayed with you until you had fallen asleep.

...

Bucky Barnes/ The Winter Soldier

One thing Bucky had noticed lately was the age gap between you. Sometimes, he just couldn't understand what you were saying. As he watched you interact with your friends, he began to think that maybe you'd be better off with someone your own age so he packed up his things. Bucky walked out into the lounge room where you were sitting, his bag in his hand.

"Bucky? Where are you going?"

"Y/N, I'm leaving you."

"What? Wh-why?"

"Because I'm too old for you. I don't fit in, in this world."

"Bucky, you do. You do fit in. Please don't leave me," you said, tears streaming down your face.

"You're young, you'll find someone else."

"I don't want anyone else. I love you, Bucky."

"There'll be other people."

"You're the only one for me. You're the only guy... that I've ever been with," you sobbed. Bucky scoffed at this.

"That's me; a dirty old man taking a young woman's virginity."

"It wasn't like that!" Bucky gave you a tender kiss.

"One day you'll see I'm doing this for your own good."

"Bucky, please... don't go," you begged. Bucky walked out the door.

"Bucky!" You waited for him to answer you but he never did. You completely broke down.