Just for some context, me 19M and my bsf 21M (I'll call him Zack) met not long ago, like 8 months max, but just from the start we clicked. Wed spend hours at the uni chatting and hanging out togheter and even tho he lives 1h away from me wed always meet to do some nerdy stuff like cosplay or listen to k-pop and share photocards ECT ECT. He's been dating this one guy for an year now and I must say he makes Zack absolutely miserable. When I met Zack he was crying in the uni building because of something the guy did, he was ghosting him and ignoring him for two days for apparently no reason, and from that it just got worse. He'd come to the classes absolutely miserable and with little sleep because of a fight they had and stuff like that. The guy would sometimes "break up" with Zack just to make him crawl back begging to him. Last week tho it was the last straw to Zack, he was finally the one to break up "for good" in with made him cry and barely get up from bed for 5 days straight, in with I've been by his side all through, I slept in his house on the couch because I was really worried he'd do something to himself. I ordered us food, played games with him, and everything to hype him up. Yesterday a friend of his ex bf texted him saying "how much of a horrible person he was for breaking up with a BPD fragilized guy" and that "he's horrible and selfish", straight up manipulation, because thats all this fuckass man do, and sadly Zack fell for it. He cried and cried and decided to have a face to face with his ex to "settle things", I was obviously against it, but it's really not my business and I shouldn't try to tell a grown ass man I know for less than a year what to do. I was still in his place when he got to Zacks house, he gave me a big side eye before I told Zack to stay strong and follow what's the best for him and went back home. I woke up early today to a message saying they got back together, and I honestly got supper pissy about it but I just answered with "if that's makes you happy then I'm happy for you! I'm just glad you're feeling better" and tried to keep acting friendly like I always did, sending stupid reels and tiktoks and shit like that, but this time he didn't answer me all day. Now, at 8pm, I just received a message from him saying that his boyfriend is not comfortable with our friendship and we should distance ourselves. I obviously went nuts and wanted to say all the fucking things to him, but I decided to just keep my cool and answer when I'm not so hot headed about it. I feel like I need to clarify that I'm a straight guy, I have no feelings of jealously or whatsoever to Zack or anything like that, nor have I ever gave a reason for his boyfriend to be uncomfortable with our relationship, I'm not a touchy guy, all we do is spend time together like friends do. I assume is probably because of my disapproval of him but I always try to tone it down because, again, it's really none of my business. Still, I'm mad as hell, I spend the last 5 days letting him cry on my shoulder, buying meals and everything with him just to be discarded like that because that asshole felt pissy?? Zack himself told me I was the first guy he ever had to talk about nerdy stuff and that accepted to hang out with him that much, fuck, I spent more time with him than his stupid boyfriend, I felt like it meant nothing to him now and I feel stupid!!! Even if they break up in the future I really do not want any more relation with him at all after that, I really feel like an idiot. AITAH?