Sex from outside the relationship?

My boyfriend of 11 mo recently told me that he wants to fuck other woman and the only reason why he don’t is because he doesn’t want me to fuck another dude ( which I have no interest or want to do so). He says that every man thinks this way/wants to do so, if they say they don’t then they are either gay or lying. I don't know why but this has messed with my head for the past week.
Sex from outside the relationship?
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