Guys give me your input?

a guy friend of mine has a gf i respect that. Every now and then he'll txt or facebook chat me and we catch up by the end of the chat he always tries to turn it ual adn i bring it back to platonic. Why does he keep doing this? We did make out and flirt b4 he was with his new gf and have always been flirty. Does he like me or is he just trying to get some?