My cheating ex girlfriend, fiancé wants go cheat on her with me. Should I do it?

I’m bisexual … he’s even paying for her and her mom to go to dinner just so he can have the apartment free for a night knowing she will stay at her moms after bc they don’t live close…

she cheated on me last year, had sex w a guy in the same car as me at the very start of our relationship before we were exclusive but still

My cheating ex girlfriend, fiancé wants go cheat on her with me. Should I do it?
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