Aw don’t be scared, there is nothing to do but be yourself :)
Awwwwh, it’s not a dream if it’s real :) just keep talking to him as you do at the moment because you never know what could happen in the future :)
If he has a girlfriend you shouldn’t really get in the way, that isn’t really nice to them to try and get in the way, sorry, I think you should just stay friends.