Healthy Relationships Support Group
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If he continues to deny it even when faced with proof, then I think you have a problem
It may be as simple as he didn't want to argue however once someone lies it's hard to trust anything that they say...
Five years is quite a while to be dating and if you can't trust someone when you're dating the future looks grim ..IMHO.... I hope you can open up some lines of communication.... big hug....xo
It's not about the strippers. It's about trusting each other and not lying to each other.
If you let this one go, you are giving him the green light to continue doing these things and lying to you about it. If he did cheat, cheaters lie, and they don't tell until you show them the smoking gun. Come over to the Infidelity board and post the same thing and see what sort of replies you get.
Like you said, he's been to parties where there were dancers in the past and he's told you about it, yet this time he said there weren't, and you know there were, so why lie about it?
I would do more digging and see what you can come up with, but for me this would be deal breaker.
I wish you well.