AM i overlooking this?? IS he just being friendly towards me?? Thank u!!?

You need to talk to him and ask him what's going on. 'You've been acting different lately, always grinning at me. It's starting to bug me. What's going on? Is there anything you want to tell me or ask me?'. Then its up to him to explain. If he doesn't, then you can just tell him to stop behaving like a grinning idiot, because it's annoying you.