Parents banned me from seeing my boyfriend... please help :(

My boyfriend has been to jail before, the same jail that my dad works in. My parents don't know him and I are dating, but they know we talk. My dad told me that I'm no longer allowed to see him or speak to him.. but I can't break up with him, I love him so much. What the hell should I do? I sound so pathetic but I can't lose him.
Parents banned me from seeing my boyfriend... please help :(
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