I (17M) and the guy (19M) who we'll call Harry for the sake of the post have talked since November of 2024. I, from him, knew he had gotten out of an 8 month long relationship with a girl (18F) who we'll call Katie for the sake of the story after finding out she'd been cheating on him for a while. I had broken up with an ex of mine who treated me quite badly in early November and we met in late November, so we sort of bonded over that fact quite easily. We bonded over quite a few things and were always talking about anything and everything. He'd call me "darling", "pretty boy", "prince" and many other things while we also flirted very openly all the time. My friends loved him and even loved hearing about Henry. The thing was that Henry still hadn't introduced me to any of his friends which I didn't have a problem with since we had only been talking for two months before he asked me to date him. When he asked me to be his boyfriend he revealed that he was still in a relationship with Katie and said "I haven't broken up with her because she has threatened some pretty nasty things like comiting suicide and I'm scared she's actually going to do it." Having been in the situation and already being in love with him I was okay with it and they broke up a few days later where he openly told her he just didn't want to be with her anymore. I will add that Henry is quite literally the perfect guy in my eyes. He plays guitar, he's smart, he's funny, he's sweet, he's endearing and he treats everyone with kindness but doesn't let people walk all over him. We have playful banter all the time, he always tells me I am beautiful and always makes me smile no matter how much we argue and whatever we say it's just weird in a way because we always end up forgiving one another and talking it through like two days later. He's, in other words, perfect. Our relationship didn't last long though and we broke up because his mental health didn't quite let him be in a relationship at that moment and he was doing quite badly and I understood that. So we broke up and then he confessed to still being in love with Katie and not wanting to have anything to do with me. I still speak to him all the time and am even close friends with his childhood best friend, but he says that he still doesn't want to date me specifically since I don't live as close to him as Katie did. It's a heartbreaking thing for me knowing all that I felt for him and everything. This is where the AITAH part comes in. Two days after Henry and Katie break up I followed Henry on his public social media account and Katie soon found out. She logged into his accounts and started harassing me, demanding to know who I was and why I was speaking to her ex boyfriend. In the messages she bragged about how she had sex with Henry and I haven't, saying very vulgar and disgusting things objectifying Henry, called Henry slurs (which I won't go into details of) and also bragged about being skinnier than me and the fact that she had anorexia and I didn't (somehow that gave her an ego boost that I was "fatter" than her). In the end I was very unserious about the whole thing while she just called me names and things like that, saying that I needed to pay and that she's going to send people to my house. She's even tried to humiliate me multiple other times which I thought was a little unnecessary since I hadn't talked badly about her, but I digress. I never denied that being the "mistress" was bad but I genuinely feel that she deserved it since I have found out from him recently that she was physically abusive towards him because he showed me video proof and also proof of her mainly only calling him over to her place when she was alone so they could have sex. So I feel like the AH but also at the same time I don't. I want Reddit to tell me if I could've done something better given the fact I didn't know about him being in a relationship.