Guys ability to perform

So my boyfriend jacks off almost every day we don't have sex and when we do have sex he has a hard time cumming like it takes a long time for him to cum or he just doesn't at all. Last night he told me he hasn't jacked off in two days but he was tired. Does jacking off and fatigue effect a guys ability to cum? I know that he says condoms effect him but for a long time before this week he was able to cum once we both got pleasure with a condom on. I feel like I fail to please him when he doesn't cum and I don't know if it's my fault or because he jacks off on the days we don't have sex.