relationship problems???????????????????????

I've been with my boyfriend for three years now, and I'm starting to think that he might have feeling for someone else, what should I do? I go to school full-time, work full-time, I take care of home. Our little one is in the bed and feed and cleaned before he comes home. He always has a hot meal waiting for him when he walks in the door. I run him a bath or whatever and I sit and ask him about his day and I rub his feet and other parts. All I ask is that he shows me respect, and love that is it. and at the end of the day I get nothing but his behind to kiss. What is that about?