Why can’t he last as long anymore?

When I started dating him before we had sex he told me that he has been able to last for 2 hours in his past relationship and he told me that he could probably last even longer than that if he wanted to. I know he didn’t lie I’m sure he used to be able to last that long... I don’t quite know how long ago it was but I’d say around 10-5 years ago is when he was able to last that long

But he cant with me. Ever. He comes within 2-10min (10 being max) he tries to last longer but he can never.

Unfortunately even 10 minutes are not enough for me and I need it for much longer.. I know I can try to get myself off and stuff or get me off first but this isn’t about that...

I just don’t understand how he can go in a few years from lasting 2 hours to only being able to last max 10min.

He is in his early thirties.. so how did it change so fast and so bad. I’ve heard that men are supposed to last longer as they get older not less. Is this going to get even worse as he gets older ??