Hurt

I just hurt someone's heart recently, that person is very nice to me and yet, I hurt that person's heart. Why am I like this, hurting someone's heart when that person is so nice and important to me? I'm now worried that if he doesn't forgive me, I've been sms-ing him, trying to gain back the trust, but it seems unfruitful, because the mutual trust had been betrayed. I broke my promises time and again, I'm actually quite happy that he still continue to sms me, but what I want is to be back to those days before. Hopefully he can forgive me.