Soooooo.

I'm 17, I've been on and off with my boyfriend for 3 years now. 
He's abusive, and I've always gone back now matter how horrible he's been. 
I've gone home with bruises, sores black eyes, everything. But everything my hearts broken. 
And these past few days, I have realised, I'm falling out of love. 
I'm scared of him flipping out and hurting me, I don't want to go through something like that with him again.
I'm scared. 
We've stopped having sex we've had sex 3 times in 5 months, mind you I'm 17, he's 21 I've been sexually active since I was 15. I just feel like he's lost feelings for me, and takes it out on me, but hurting me.
I just wanna leave, but I'm so scared :(