Is it normal that i think i'm in a relashionship just for the sex

I'm back in a relashionship with my high school sweet heart . And it is a girl if it matters. I love her but I really don't have much to say to her. I think it's bc I have no job and really nothing to say. I love to watch tv and I rather do that then talk to her. I feel horrible for my feelings. I think their are other things that come in to play. Like she is bestfriends with her only girlfriend after me 6 years ago. Idk what to do . I love having sex with her and when we do it's the best and I feel like I can't live with out her . But when we r not sometimes I feel like we should be apart is it normal