My girlfriend won't let me go to the gym alone?

She says she won't let me go because I flirt and look at other girls. Okay like come on every single guy in the world checks out other women... Is she right? do you do do that to your boyfriends? and by the way sometimes females just start flirting with me I even had couple girls ask for my number...But I'm not that cheating type. I'm confused what's wrong and what's right
My girlfriend won't let me go to the gym alone?
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