Is one woman ever enough for a man?

I’m on a road trip with my boyfriend and two of his friends, we all work together. I thought things were good with my boyfriend and I. As we drove into a different city we drove past a popular strip club and his friends wanted to go. My boyfriend laughed saying they’d all struggle getting up because they’d be so hard. This hurt me so much because I think strip clubs are 100% cheating. I can’t even look at another man let alone get turned on by someone other than my boyfriend.
My heart just feels completely broken and like he emotionally cheats on me. How often does he look at another woman while I’m there and when I’m not and he thinks lustfully of her…
I feel sick and absolutely heartbroken. Why do men do this? Why can one girl not be enough?
Is one woman ever enough for a man?
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