MY very first break up..please help?

This girl IO been dating for 5 months..shes been great. we had few arguments, but there are those times when i get jealous, and do things to purposly upset. I did tht las night..we had loong interesting conv earlier this morning. We had planned to spend time with eachother tonight.. but then she txtd me n wus like, i wanna see you. but im sick of this and the arguing. We talked for long time on the phone. I tried to convince her that she is wrong, and I don't understand why she is leaving. she said she is sick of the arguing which confused me, cuz we didnt argue much. Then later I showed up at her school. Shes like, why are you here? I'm like, you are making a big mistake.. I don't understand. We talked more and more. We both cried. I'm like give me another chance, shes like I gave plenty of guys chances..I just can't anymore..Then later that night, she gave me the reason. She walked me back to my car and said, I love you, but did you ever get that sparks feeling when we kiss. I'm like yes! SHes like, I lost it. I'm sorry. FIrst 4 months were great. But I jsut don't feel the same anymore. I've never been more hurt in my life....I don't kow how to handle this...especially since school is about to start