Guy problems!!!!!!!! HELP

Ok, so every boyfriend i’ve had has always been really mean to me, and then i started going out with this guy, its been 8 months now, and he was really nice in the beginning and now he’s a jerk, like really, really mean. And whenever my best friend comes around he always makes me smile, and laugh, and he looks at like I’m perfection, and I absolutley LOVE that. So now all I think about is my best friend, he’s everything that I love, and I’m starting to get feelings for him. But my current boyfriend is begging me not to leave him, and saying that he will change. What should i do?????