My girlfriend want to do a threesome with me and her ex-boyfriend, why she behave like this?

cuckoldamol
Me and my girlfriend have been in relationship since last 3 years. before we met she had one boyfriend. after her breakup we met. in last three years we had a good sex life. we both are happy and trying best to do all the things fir each other's pleasure. we love so much each others. one day we asked about each others fantasy. and she told me that want to try a threesome sex. she want meet her ex boyfriend to just have a sex with him and me. she trying to convince me to do threesome with her ex boyfriend. she is not going to cheat me. we love each other so much. but why she wants to do that? is it normal for girl? please tell me what i do?
My girlfriend want to do a threesome with me and her ex-boyfriend, why she behave like this?
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