I have someone very dear to me that was once in a situation that your story brings back memories of. It was quite a few years ago, she was your age and in a very similar sounding relationship with her mother and a boy. I won't ramble about the details and outcomes, but I would say there could be more of a worst case scenario. Simply call it off with the guy, then put everything into working out the dynamic with your mom. You are the one dating him, not her, she should be more concerned with your happiness than his, or what anyone will think about your choices.

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