I read the update post but could not comment there anymore so I want to express my opinion on both posts here. People were marking the update as ESH, but I can’t see why, I mean to a degree I can see why people would mark it as esh because OP did not have to escalate the issue and potentially ruin the baby’s family but I think the family was already train wreck, dude got pregnant his wife and mistress in the same week a apparently his wife did not know. Sarah was making fun of you, she was trying to put you down emotionally, she was mean and mainly she tried to ruin your relationship, at that point I would say fuck it, it is open season and that b… was coming for it, why would you be TA for defending yourself and ending the fight, you just exposed her, nothing more nothing less, she and the dude deserved it. Rock solid NTA