No sex?? Uggggh

So I’ve been w my partner for about 3 years he is 15 years older keep in mind. And we have not had sex oral sex nothing in about a year... he says he just doesn’t feel like doing it anymore. Now he was having trouble sometimes but he wasn’t shy before to give it a try even if didn’t work every time for him...

And when I try to talk to him about it he gets kinda angry says that’s all it is to you just sex and basically ends the convo.

What’s the deal?!?