It was all just too much for him.
Everything was just too much. From the moment Pietro stepped into the Avengers tower for the second time or perhaps even before. Perhaps it was from the moment the whole team rushed to get him to Helen Cho's laboratory and save his life. Perhaps it was Cho's kindness in helping save his life after he endangered hers. He felt guilty, partly for not dying when so many did, partly for getting hurt and almost leaving Wanda all alone. Her love, her trust was enough. However the concern the rest of the team show was just too much. He couldn't help but cry when he heard that Hawkeye-no, Clint sat by the regeneration cradle whole night while he was in chemically induced coma. When he woke up, he felt reborn. And angry. And unworthy. He didn't deserve a new life.
Pietro was genuinely surprised when Avengers offered to take them in. They offered to be friends, they offered to be family. They offered too fucking much. He wasn't sure what he wanted them to do, but one look at Wanda's smiling face told him this was what she wanted. He accepted. This was the right choice for her. He couldn't leave her alone. Not again. At least here she could find friends and someone to protect her if he dies again.
New wave of guilt hit him when he saw his new room or perhaps it was a set of rooms? They were the size of small apartment. He had his own bathroom, a walk in closet, a mini bar and a "small" space for his own private training with custom made treadmill, courtesy of Tony Stark. He described it as the ultimate man cave, whatever that meant. The colors that dominated were blue, grey, black and white. Bedding was white and blue, leather sofa and the rest of the furniture was of light wood while fluffy carpets were grey. And of course, the latest gadgets went in the package. The room even had a balcony that stretched down the whole length of his room. Pietro was told that he was going to share it with the new recruit if she accepts their offer. For some reason he was glad for it. He wasn't used to having a thing only for himself. He felt uncomfortable there, the walls were suffocating. When Stark handed him an envelope with a credit card Pietro wanted to punch him. He didn't. He knew the billionaire meant no harm. So he took it, vowing to himself that he's never going to use it and hating himself for knowing that he is going to break that promise.
Surprisingly, Wanda who was considerably less materialistic had no problems accepting anything from Stark. She danced in her new rooms and explored them like a child would. And yet she showed such gratitude the she immediately brightened the room. Stark beamed. And so did the rest of the team. Wanda was a much better fit, and yet he was supposed to be the extrovert.
The first month went in blur, even for him and yet Pietro couldn't say that the situation very much improved. Missions and training were the only part of the Avenger life he didn't loathe. It was still too much for him. He couldn't tell which was worse, the press conferences, afterparties or the formal dinners. Few months ago he would have appreciated being surrounded by beautiful, posh women who wouldn't have wanted to have nothing to do with him if he wasn't the part of Starks menagerie. Now he was awkward around them.
As for other Avengers, Hulk, Clint and Thor were absent and Wanda was still the only member of the team whom he willingly spoke to. She stroke an odd friendship with Vision which he wasn't sure that he liked because it felt like betrayal. She on the other hand was equally concerned for him. He told her that it was nothing and started running at nights. Pietro ran to test his limits, he ran because he couldn't sleep and he ran from the team. Still, he always came back for Wanda.