boyfriend embarrassed about finishing fast?

Maddi

alright so my boyfriend and i have sex pretty frequently and this has never really been an issue with us. i always end up finish first and usually pretty quick but he normally goes for a good 40 minutes or so. i'm just used to having sex for awhile with him.

tonight i was on top (which we do pretty often and it still usually takes awhile) but he finished in like 10 minutes. i didn't finish but i still thought the sex was great so i wasn't bothered in the slightest. he got really embarrassed and felt guilty and said it wasn't okay that he finished and i didn't etc. i keep trying to reassure him but nothing i'm saying is helping. i don't think he has any reason to be embarrassed and i'm not really understanding why it's such a big deal.

he had told me before that he was really horny so i don't know if this played a part? i don't think we did anything out of the usual either. idk i don't think this is really a big deal but apparently to him it is.