Advice

Sooo not sure if this counts but I need advice. Ive been talking to a guy for awhile now and I really like him and I wanna have something with him. But any old best guy friend came over and talked for awhile since I hadn’t seen or talked to him in a long time. And nothing happened but something felt different. And he has a girlfriend but he’s been super flirty with me which was normal for us no matter what. When he hugged me it felt different and we went and sat in my room and he was laying on a pillow and now the pillow smells like him. I’m not sure what to do and he’s worried about being that guy who hurts his own relationship and I don’t wanna be that girl cause I really like the guy I’ve been talking to. Any advice on what to do ?