Stuck in a routine

My SO and me never do anything together. All we do ever is lay around the house together and watch tv. But when he's with his guys friends, they're always out doing things. I ask him why we don't do those things and he tells me it's different with me than it is with his boys. I need advice. Should I be offended? I am, but I kind of understand. I'm just tired of him not wanting (or feels like he doesn't want) to do anything with me. He says there's nothing to do. And ideas of things we could do together that would be fun for the both of us.