Why does my wife cry during sex?

Ok im with a women I was best friends with for 9 years I have 3 kids with her and we been together for almost 2 years and the last time we had sex she cried out of the blue I ask her what was wrong she said she didn't know. and last nigh we had sex and after we got done she was crying again I ask her what's... show more Ok im with a women I was best friends with for 9 years I have 3 kids with her and we been together for almost 2 years and the last time we had sex she cried out of the blue I ask her what was wrong she said she didn't know. and last nigh we had sex and after we got done she was crying again I ask her what's wrong she said she didn't know and she was fine after words I ask her if I hurt her during sex she said no this was the second time this has happen .but she been eating a lot yesterday saying her back is hurting and feet are swelled up could she be crying cause shes emotional and Pergo help
Update: im only asking this question because im so board
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