How do I stop being a jealous girlfriend?

I have been in a relationship for three months. We are happy, he is trustworthy and he doesn’t text or have any girls on his phone. Even though he’s perfect I’m still super controlling about the girls on his phone and I delete all girls on his social media. I know this isn’t right but I have had cheating ex boyfriends and abusive relationships in the past so I don’t know how to fix myself and my jealousy. Please help.
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