I want to break up with my boyfriend, is this a good reason?

I dont trust him. We are a quarunteen couple. He hasn't met many of my friends but the one he did meet he flirted with her when we were just friends. I gotta admit I was pretty jealous. I'm still very jealous that this happened more than a year ago. He swears up and down he didn't stare at her but I was watching him do it and she was blushing as it was🤦🏾♀️... I don't know what to do. He won't let me break up with him. He wants to ALWAYS work it out
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