I’m jealous because my girlfriends guy friend tried to kill himself

For context my girlfriend (f16) and I (m16) are in a long distance relationship at the moment and even though we’ve gotten countless comments saying it’s not sustainable for our age and it won’t work we really do make our relationship work in quite an amazing way. We’ve been together for a little over a year now and we’ve had very few issues or arguments and I really truly love her.

My parents are quite hard on me and I don’t want to say abusive but things escalate quickly in my house and I constantly live in high stress because of it. My mother and I got into a pretty heated argument about my routines and habits which led to me texting my girlfriend about my frustration. I went to have a shower to cool off before I did anything rash and when I came back she did reply to my rant but she also told me about how her guy friend tried to kill himself. I don’t know the guy too well but I’ve never really liked him. Him and my girlfriend hang out quite a bit which isn’t an issue for me I’m not the kind of guy to be in my girls business and say she can’t have guy friends but my girlfriend and I call a lot and sometimes he’s over when we call and he just constantly mocks my accent and asks me stupid questions about where I live because I’m Australian and he and my girlfriend are American. They’ve known each other for over a decade and I think it’s great she has such long lasting friendships but when she told me he tried to kill himself after I ranted to her about how small I feel in my day to day life at home I sort of felt pushed aside? If that’s the right term I don’t really know but I just didn’t feel good. I know the title said jealous but even then I don’t know if that’s the right word because I’m not sure what I’m feeling it’s just sometimes I feel like I’m not doing enough for her? I don’t want to be the overly jealous boyfriend type and I’m scared that’s what I’m becoming. I don’t know what I feel towards this and I’ve probably worded everything really badly but I’m just upset.