Unless he tells you he's interested in you, you shouldn't read more into it because he has a girlfriend.
It's a problem caused by your friends then. For all you know, he's been more observant because he noticed you being all awkward around him. Don't let what your friends say affect you. It's easy to make things complicated because they're not the ones in the middle of it.
i think he might want to cuddle with you. ****** up considering he has a girlfriend but I definitely know what that is like.
I'm no mind reader he might like you more than as a friend or he just likes you better than the rest of your circle