Most Helpful Guy
I can understand how it hurts you. Guys sometimes feel the same way if he finds out that his girlfriend did things in bed with previous partners but won't do them for him. You feel like he gave his best to her and that she got something you didn't.
Maybe try and posited encourage him to get in better shape, or maybe see if there's something he he could do with you that he nrver did with his ex.
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Most Helpful Girl
I wouldn't due to the fact that it's his ex and it's not like he said he had it with 8 different girls. He just fucked her 8 times in one day. I also wonder what he considers that because some people think blow jobs counts or him eating her out etc.
Now for your situation, I would explain to him that sex can get him into better shape. There are also ways for him to gain stamina though as people age they do lose it. You feel how you feel though I would personally feel fine (yet I wouldn't even be talking about past relationships anyway).