Girl Interrupted

I don't know what to do.

I really like my boyfriend, like, we've been together for three months, we have so many things in common it's not even funny. He's introduced me to a lot of things, and I've introduced him to many things, but there's something wrong. I have not clue what it is.

Ugh!
I have no clue!
It's like we're totally distant from each other, and then.... I have don't know. It's hard to explain.
I don't want to break up but I don't want to have a bad relationship with him.
*sighs*

Does anyone know what I should do?
I've tried to talk to him, but... no. It didn't work.