A girl (27f) I've (22m) been seeing for a while and getting serious with has a male bestfriend! I've been seeing this girl for about 6 weeks now and everything is going so well and we a really getting close. She has very strict rules of not cheating and I trust her, but she has a Male bestfriend that had already admitted he has feelings for her but he is okay with just being her friend. 

She is in a bad place where she lives and is trying to find a new place, she can't stay with me unfortunately cause my situation is difficult. So she is considering shortly moving in with him and I can feel I'm not comfortable with it. 

I really don't wanna be jealous or insecure but I'm not feeling good about and need some advice on what to do. I don't wanna ruin this between us, but I'm not happy with this!