Girls, what would you do in this situation?

I'm dating with A. but B constantly wants to date with me (i have feelings for him as well) B didn't give up when i mentioned i have boyfriend instead he gets even more motivated for it (love his confidence) while A learned about that and gets mad at him while im saying i dont have feelings for him he says ''no its ok its my role to make you fully be mine''

Girls, what would you do in this situation?
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