Letting Go

I've meet someone whom i never thought i could fall in love with.
He makes me feel alright, until one day i found out he's cheating on me
Though he asked me for forgiveness so i have forgiven him.
But then it seems that he keeps on repeating the same mistakes that he have done, cheating all over and over again. I was already thinking of letting him go, but it seems so hard for me to do that. i gave him another chance to earn my trust though he tried he's best but it's just that he was born as jerk...so i have to let him go because he cannot change himself from cheating!