what to say I'm tongue tied (no judging)

Ok so me and this guy We use to be cool as friends like he use to call me his sis and I use to call him big bro but anyways one night I was so tired body was sore and I ask him for a massage and he gave me one but then he started kissing on my back and stuff and we ended up sleeping together every since then we been sleeping together but now my feelings are deeply involved like I wanna be more like his girlfriend but he was like he not in a position to have a girlfriend and I got a lot going for myself and he don't want to add complications or watever but I told him I wanna be there for him complications and all but I guess he don't think I can handle it  What would u say to him if u Was in this situation?