Am I wrong for being uncomfortable

So I am in a long distance thing, not a relationship but not, not one (I know that makes no sense. Well call it.... open but by “necessity”) He doesn’t think it’d work as an official relationship because we are 2 hours apart and he has a busy schedule. i understand that I cannot change if he meets someone there he wants to be with.

That being said, is it weird for me to feel weird that the other night his coworker was having a bad night and was breaking up with her boyfriend, he told her it was okay if she stopped by, and that was at like 10pm? She ended up there after 1 in the morning (I tried to stay up but I wake up early and was too tired) and was there for probably 3 hours. Ever since he’s been more... couple-y than before (it that makes sense) and he just disappeared from texting me with a “Busy I’ll ttyl” I don’t really think that’s related but I just feel weird about the whole thing. Maybe I’m just being insecure...

when I say weird, I mean if my feeling unnatural or unfair. I know I don’t really have the right to treat it like he’s my boyfriend when he isn’t actually because we don’t call it that.