Frustrated/confusion.....need advice anyone?

So my bf n I are on a rocky patch. We haven't been together long, but when we met, knew we had to be together. Anyways, in the time we've been together, this is the first time we've actually spent away from each other (aside from the first month we started dating). I should also mention, we live with his mom. Anyways, for the past month, he hasn't been staying home or wanting to be around me. Always wanting to go n be with his mom. We are constantly arguing or fighting about him leaving. This time they haven't been home all week and I'm starting to think that something is going on. I know they say space is good for a relationship, but this much? I don't know what to do? Need some advice please?