How to stop from being jealous?

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Have you ever experienced seeing your boyfriend with another girl and you just can't help but boil? I have... for so many times I feel that I'm not making sense anymore! Even though he is just with his friends, or past high school friends, I can't stop myself. It even came to a time that I forbid him to see anyone or go anywhere without me. I always get into fights with him, and it only ends up hurting me. I have already told myself that I shouldn't be insecure, my boyfriend loves me. But I can't help but just get jealous! What should I do? I know that I'm not fair anymore to my guy...