Should I tell my current partner that my ex cheated on me? Would it set the limit for how much bs I can take and let the current guy get away w it?

I've heard many people say that you shouldn't tell your partner what your ex did to you and it sets a limit to what bs have you gone through and how much he can test my limits and get away with. If I've been treated a certain way in the past that would also reflect poorly on me and how much I've taken. It did come up in a discussion with my current partner and I dodged it but I'm reconsidering letting him know what happened but I don't know if I should.

Should I tell my current partner that my ex cheated on me? Would it set the limit for how much bs I can take and let the current guy get away w it?
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