My ex-boyfriend's unusual living situation (sharing a house with the mother of his child) makes me feel like a homewrecker. What do you think?

Anonymous
My ex was a guy who, when I met him, still lived with the mother of his child (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 listened to their conversations (we had a system where I’d call him when they were talking so I could hear everything; I know it’s weird but I needed to be sure). That's how I confirmed that they were over and nothing had happened between them in those three years. I asked for proof (which he provided in many ways) and that he moved out, which he did a couple of weeks later. Everything was okay until the ex started acting weird and fighting him over everything. I got suspicious, so they talked and she told him that she still had feelings for him. After that, we 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. To be fair, I don’t think he lied to me. She never said anything or tried fixing their relationship, and he was clear with her that they were over for good. 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, 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. 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?
My ex-boyfriend's unusual living situation (sharing a house with the mother of his child) makes me feel like a homewrecker. What do you think?
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