Not lasting long enough?

My fiancé and I have recently stopped using condoms since I'm on the pill. He used to last almost 20 minutes and now he barely lasts 5. I can't get off anymore and it's really unsatisfying that I get all worked up and then I get nothing from ot. He can't get it up after he comes either so there's no chance of a round 2. We are in our 20's so this shouldn't be a problem, but it's ruining out sex life! I don't even feel like initiating sex anymore because I know I won't get anything out of it. I'd rather just use my hands to satisfy him rather than being disappointed again. What do I do? He tries his best to last longer but it isn't working.