Sounds like she afraid of something happening or insecure. If it has to come to stuff like that why date the person. I have plenty of guy friends on my instagram that are in relationships some even married. They don't go deleting females lol.
I can understand her point of view to be honest. Nobody likes it when their guy stares at random women's asses.
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Doesn't sound like a good relationship
Maybe it isn't
Ehhh oh well