He Never Finishes...

So, me and my SO have been having sex for about eight months now. We usually have sex about once a week. In total, he’s finished about 5 times while I finish almost every time. He says it’s fine but I feel really bad/guilty about it. I do try to make him finish, but he lasts wayyyy longer than I do (he takes about 90 minutes and I take 10). Am I being irrational for feeling bad?

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