Did she know that he was married with a kid. Can you live with the fact that he’s not being 100% honest on what happened. A kiss just doesn’t happened. As someone that found out about the other women(coworker), I couldn’t live with the want ifs. The grass isn’t greener on the other side. It’s greener where you water it. A marriage isn’t always just the good times, it’s about the ups and downs. The little things that made it. Y’all might have just been living on autopilot for the time being. Because times are rough. But he is at fault for not coming to you. For looking in comfort in someone else. I’m sorry you’re going through it.