Guys, why do you try to change girls instead of just leaving the relationship?

I hear about a lot of guys getting upset that their girlfriend goes out to bars and clubs, or has close guy friends. And they try to change them. And girls will always consider this to be controlling. Some even call it abusive. Why not just end the relationship? They are who they are and you want what you want. If she isn't who you want her to be, why not find someone who is?

Guys, why do you try to change girls instead of just leaving the relationship?
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