Why does my ex act like he owns me? Guys explain!

He wants me to stay by his side but he doesn't want to stay by mine.At least that's how I see it he is a real sweetheart.it's just I don't trust him to the fullest.He gets mad when I tell him I talk to another guy he says naw you better not be.He ain't nothing like me.But I never bitch when he is with another girl..Im confused why does he do this?
Why does my ex act like he owns me? Guys explain!
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