He wants to have sex every time I see him but some days I'm not feeling it.

I only see him once a week because he works two jobs and his only day off is Tuesday but when he comes over all he wants is sex before we go out. there are days where I don't feel like it but he doesntbunderatand and gets upset. There have been occasions where I let him and I don't enjoy it that much. Today he came over for a little but and he wanted sex so I denied him because I just don't feel like doing it. He made me feel down and upset sometimes I just want to cuddle and watch something but he doesn't like me watching anything. I don't know how to feel or how to tell him I'm not an upfront person I never was. I always let people walk all over me but lately I have been putting my foot down and tellin him no but this is different..... I don't know how to address it. he is a wonderful person that guys me what I need but sometimes I don't want to be spoiled all I want is cuddles and t.v. time. Help me!!!