Do you guys turn a "blind eye"?

I'll keep it brief, my fiancée (having second thoughts now) has been sneaky. And its not the first time. Last year I caught him cheating. Fast forward to now and his thing is social media/emails..he has accounts on dating apps and is currently active on them. He is a decent guy (i can't say good bc of this issue) and does everything right besides this. Should I turn a blind eye and "let men be men" or call it out? I've never been good with confrontation so I've been holding it in for a few months now.

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