Why do most girl’s think it’s ok to ask her partner if they are cheating on them but when her man asks her he is insecure?

I witnessed this and experienced this with Girls, It’s ok for her to ask her partner if he is cheating on her but if he suspects her cheating on him , and asks her , automatically he is an instant piece of shit insecure bastard? Why do girl’s do this shit? Me personally feels if a girl gets defensive about that question I pretty much assume she is cheating on me because why in the hell is she getting so defensive and mad about it? Most girl’s assume men don’t have feelings and that it’s ok for her to be insecure but not ok for him
Why do most girl’s think it’s ok to ask her partner if they are cheating on them but when her man asks her he is insecure?
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