Dear Bitter Guy -- Relationship advice for singles and not-so-singles

Dear Mr Bitter Guy, I need dating advice ...

I usually have sex with my bf for about 15-30 minutes. sometimes longer. We usually stop bc i get tired or become too dry.

He gets very annoyed and makes me feel like every girl lasts alot longer.
what is normal here? also we both never ever climax with eachother, and usually have to do it to ourselves.

i might add, we are not dating anymore. this is a past ex and just curious on norms. I was in a pretty messed up relationship with him, and i wonder if that aids to the rocky road.