LGBT: Is it possible that my much younger boyfriend may want to leave me for someone his age?

As a 52 year old overweight gay man, I thought God blessed me when he sent me someone two years ago. My boyfriend Sean is 25 years old and he came into my life a year after my partner of 27 years ped away. I love Sean and I'm very good to him. Early every morning I put breakfast at his table and make sure that his eggs, pancakes and bacon are cooked the way he likes it. All is missing is the morning kiss he used to greet me with. Sean is currently collecting unemployment and attending college full time and I have a good job at a bank. After work, I fight my way through the rush hour trying to make my way home to cook and make sure that his dinner will be waiting for him. When he gets home, sometimes he'll tell me he's not hungry at all, he said he'd rather do homework and play the Xbox and he doesn't want to talk. He likes to think that I'm just crazy when I say that he changed but I'm convinced that the problem is he doesn't love me anymore. He's just going through the motions and it's breaking my heart, I've got too much pride to cry in front of a young kid. But it's making me weak. I'm not his superman. I'm not the kind of guy that he can let down and think that everything is okay, I tell Sean that I'm only human. I need more than occasional f*cks as a token of his love for me. What should I do?