Fiances work Xmas party has strippers..

So my fiancé came home today and told me that his boss has hired topless waitresses and a strip show for their work Christmas party.
Apparently getting upset (more annoyed but not angry covers it) that he "has" to go (or the guys will tease him) is ridiculous because "at least he told me the truth and didn't lie". 
We have a background with this area, we were broke up for a month years ago and he got it on with a stripper - we were broken up so don't hold it against him but now that he will be in their company again...
I'm feeling super unsettled about this, I am never one to dictate what he does, but when it comes to strippers it really upsets me! 
I just can't be one of those women who doesn't care - thoughts ladies?

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