It's Totally My Fault

Sometimes i feel like I'm kinda Jerk, and yeaaah that's what i feel lately
i didn't mean to hurt you or anything, i choose the girl because i know that the girl will not be in relationship anymore after she swore on me, i never though that you will that angry with me, i feel that i am a really jerk until you couldn't forgive me anymore
what would i do if you can't be my bestgirl anymore?
is it too late to fix all over?