Tony's actions ripped apart the entire family.
Peter has never been angrier. He punched clean through a wall and yelled at Wade. The ex-mercenary was just trying to comfort him and offer to take him out for some air. He completely flipped out and Wade was left in the living room and the small apartment SHIELD gave them. A few days later, Wade was taken out into the field for a year long mission. He accepted. Peter just retreated into his room.
Caroline was lost about the whole thing. Being only three, she doesn't know why everyone was upset. But Steve told her that she wasn't allowed to read their minds. So she cried a lot. Begged to see Tony so she could ask why Tony made Papa sob every night after he thought every one had fallen asleep. She just wanted her family happy again.
Natasha took up more missions so she wouldn't have to be at the tower as much until her and Clint found another place, closer to work. Clint did the same. But when they were home, they were either training or watching the clock 'tick' and watching the clock 'tock'.
Thor didn't take it very well either. Thor was completely baffled by the idea of Tony being unfaithful. The actual action... the demi-god knew not how to respond. Even Loki looked disappointed when he found out.
Bruce... Bruce hit another low. He, for the life of him, could not figure out why Tony would do that. His best friend... tearing their family apart. So the Hulk figured it out instead. Now he sat in his room at SHIELD, hand against the glass to line up with Rebekah's. Hill refused to allow the door to be opened because that, for some reason, set the Hulk off so Rebekah was forced to stay outside.
She was horrified by what Tony did as much as the rest of the family. No one could process it. But she knew something was off about it. No one thought Tony could ever possibly do this. Not to Steve. Not the Avengers. Not to this family.
And yet... he did.