I'm facing a moral dilemma. My ex was a guy who, when I met him, still lived with the mother of his child (they were not married). They had been broken up for 3 years and lived together to take care of their son, their house was huge so each one had their space and barely saw each other. I got solid proof that he was telling me the truth. I never got to talk directly to her because she wasn't interested, but I had text messages, voice recorsings ans I listened to one of their conversations (I know it's wrong, but once I secretly listened to one of their conversations where she confirmed that they had been broken off for three years and nothing had happened between them in that period of time. My ex never led her on and was clear from the beginning that they were not getting back together.). That's how I confirmed that they were over and nothing had happened between them in those three years. He provided the proof I needed to consider dating him; that was one of my conditions. The other was that he moved out, which he did a couple of weeks later. Everything was okay until she started acting weird with him shortly after the move, fighting him over money and other random stuff. I got suspicious, so they talked again and she told him that she still had feelings for him. After that, I started questioning everything, and we eventually broke up because I didn't feel comfortable with the whole situation. When we started going out, he assured me that his ex was over him and that I didn't need to worry about that. To be fair, I don’t think he lied to me. That’s what he thought because during their time living together while separated, she never said anything or tried fixing their relationship, and he was clear with her that they were over for good. Now I feel conflicted with myself. I feel awful, to be honest. I know it was a weird position to put myself in in the first place, because who would date someone who lives with their ex right? But it's not that strange to me because my parents have lived like that for more than 13 years already, so I guess I kinda normalized it and thought that it was possible for an ex-couple to live like that with no feelings involved. Apparently, this wasn't the case so I felt guilty. I think it was wrong not to talk to her directly (she knew about me but we never spoke to each other) but I just didn’t really see the point. I got proof that they were over and they didn’t get along; she didn’t want to know anything about his life and barely agreed to a couple of conversations face to face with him. Do I have to feel guilty? Am I a homewrecker?