Male Issue...Sex;Finishing;Longevity

So me and my boyfriends have been going on 3 years now. The first 2 years have been great sex wise. We bought a house together everything is going good better than expected.All except for one thing,his ability to last during sex. He has no problem getting hard.He just can’t seem to last longer than 3 min Tops. (This includes finishing)I need some help on what to do. Iv even asked if there’s anything I can do to help him. He just doesn’t know whats wrong. I can tell it makes him upset because he feels he can’t give me the time of pleasure I deserve. It’s like every time is a Quickie. I know I shouldn’t get frustrated but tbh I do! Of course I never tell him I’m upset about it but when he finishes I’m left to finish myself off and it’s getting old. Help Ya Girl Out Plz and Thank You in advance!

Open to advice &suggestions.

Please be kind no ugly comments.