Boyfriend Diff in Person

So I’ve been dating my guys for 4 months now. Before that we were friends. Always had stellar convo and amazing things in common. We start dating and I’m starting to notice that in person he’s not the same. He’s slowly being more quiet. This weekend he was tired, but was on his youtube watching videos. And slept early. I realized he was tired. But then today he leaves for work and is chatty through text. And I can’t help but feel he’s diff when texting than in person. I don’t get it and I’m starting to wonder if it’s me or if he’s just awkward around me? I mean if we have to part, if he needs space I’m fine with that. I won’t be dragged for months because he just wants someone around. I want that chatty guy who I fell for. Not this withdrawn awkward man…
What do I do?