Why do some people get upset if their SO masturbates?

I read a question on here a while ago and it was basically a girl feeling very betrayed by her boyfriend because he masturbated. She was tempted to break up with him and angry because he said he would never do it again but he did.

Personally I think this is way to controlling and crazy. But that's just me.

So my question is. would you feel betrayed if your SO masturbated? Amd why?

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