We aren't married, and we have no children, so I don't think my situation is as serious. Got with my SO at age 15- pretty young and naive, and we liked each other instantly. We stayed in a relationship for a year before I took his virginity (I was not a virgin.) He had issues with depression, and would call me when he was having an episode to help calm him down. I noticed out of the blue that he hadn't been calling me as much. My first thought was that he was just having less episodes. Fast forward a few months later... turns out he was taking comfort in another girl. Had a dream about it and demanded to see his phone- everything was laid in plain sight. Punched him in the face and cried for two weeks (raging teen angst). I gave him another chance, which was a terrible mistake. I didn't trust him at all, and I let him know that for the next year of our relationship. One day I guess I just realized that he was still dating me despite me being horrible to him because he felt guilty. I had taken his virginity, he was acting on curiosity. I was making him miserable. So, I made up a story about getting drunk and giving some guy a lap dance, because I knew he would end it. I knew that he would always crave the 'adventure' of being a single young man, and I was being a shithead for holding him back and making him feel bad about it. So, I let him go. A year or so later, we got back together after I got out of a bad relationship with another man. I've been with him for 3 years now, and my attitude now runs along the same as my mother's. I don't give a fuck if he cheats on me anymore. I don't think he has, but if he did- so what? He's had chances to do it. I don't raise a fuss if he goes to the bar and parties without me, I trust him to do what is best for himself. He's a grown man and he doesn't have to answer to me, just like I Don't have to answer to him. I suspect that my mind frame wouldn't work at all in a marriage/family situation. He's been my best friend since I was 15, and we've been through a lot together. If he strays, it's either because he isn't getting what he needs from our relationship or he's bored of fucking the same woman. If I found out, I would sit down with him and assess the situation- how he really feels about it, and if his feelings and well-being would benefit from a separation. I love this man, and I only want the best for him. Either way it goes, I'll live. My happiness can only ultimately come from myself. My only regret is that while he was running around and having fun, my dumbass got into a relationship with another guy. I never really got my own play time. Oh well. It's probably not all it's cracked up to be. Conclusion: Don't get into a serious relationship at a young age, and some people actually do learn from their mistakes. Not all cheaters are serial cheaters. Sometimes the only thing that can mend broken trust is time and maturity.