tbh I've left people over bad sex. Me and my husband have been together over 13 years and the sex is still great though. Sometimes we get in a funk where either one of us is not up for it and the other one is, but it goes both ways sometimes. My husband is 38 and I'm 33 and we've both been slowing down a bit though. Maybe surprise him in the morning if you wake up before him? I do that sometimes. Just a suggestion.