If this is a common thing in his pay relationship he might have a problem he’s not discussing. But also remember sex is mental too. Pressure is a turn off and sometimes we might be passive aggressive which is also a turn off. I understand what you mean, constant rejection hurts a lot. it makes you wanna fantasize about being wanted. You sound like you’re close to giving up. You don’t even sound like you’re getting intimacy either. You deserve an attentive caring partner who meets your needs. Cheating isn’t how you get it. You’ll feel terrible. Don’t stay out of obligation. Your happiness matters.