Post coidal disorder

I'm in love with someone that has... issues. He's got ptsd, he's an alcoholic and I can't help but only see the beauty in him. His good heart and talent. He told me this past summer he'd had a crush on me since we met and stuff happened with us very very briefly. Even though he's told me he cares about me and likes me my heart is also breaking. He just broke up with his gf/bm of 10 years and not even a week after gets a new girlfriend, casually dropping the news on me during a conversation via video chat. Both times he had a girlfriend he has still always come to me to talk even after me getting upset and hanging up on him. It feels unrequited and I can't even have sex or watch porn anymore without crying cuz I can't help but think about him. When im with someone else I just keep thinking I'd rather it be him making love to me and fucking me etc. I'm stupid I know. I'm so stupid 💔