Is he only a friend? Or a potential boyfriend?

I think the answer comes from you also. Do you want him to be your potential boyfriend or not. This guy's likely to be the one. My bf also likes teasing and insulting me sth and i rememred once time he took it too far then he said sorry few times later.I would say u should take more few times to observe..however, I can tell for sure, u both like each other. Jelousy is one obvious signal from him.