..What should I do ??????????????????????????????…

Teenage hormones and infatuation. Stop chatting to him. If he`s 27 with a g/f how do you know he`s not got a couple of kids he`s not telling you about? I`d forget him. At 11 years older he`s too old for you at your age anyway and I bet if you met him he`d turn out to be a user.