I think I like my best friend’s brother...again

ok with my friend's brother we always had "something" and I feel that he only cares about me to having sex (we never had sex) but sometimes he treats me as well as if I were his girlfriend and I don’t know what to do and every time I think about stopping talking to him, he comes back and I fall like a stupid. what should I do?! can he feel something for me or is he using me?HELP!!!!!