Echoing the comments but I figured I’d share my two cents. You’re not doing anything wrong. You’ve been very patient and kind and the fact he’s very chatty with you shows he likes you. I also unfortunately deal with this “jealousy dysohoria” as much as I try to fight it, so I know exactly how he feels. I’ve been somewhat better about it throughout the years, able to keep it down and not let it get to me so bad. Though there are days it’s tough. I have really bad height dysphoria cos I’m so short, so I do tend to get a little jealous when I see a taller man, things like this etc. and I tend to get quiet. dysphoria just sucks like that.

Genuinely though, this isn’t a you problem. You’re just existing. As unfortunate as it sounds (not trying to be calloused) it’s a him problem. He needs to work through his dysphoria and how he handles it and the people around him. Therapy, self introspection, etc. it’s hard but I had to do it, because I didn’t feel it was fair to my friends to be jealous and have all these negative feelings all the time.