I really shouldn't like him.

So there's a guy. I was talking to him as a friend while I was in a relationship. Now we're flirting like crazy, talking about sex, and are constantly talking. Problem he lives one and a half hours+ away. He's a sweetheart and I think I'm actually really starting to like him. Next week he's coming to see me and I'm pretty sure we are gonna end up doing it. Any advice? Should I tell him how I feel?