Im having problems with this girl, what should I do?

There is this girl I used to go to high school with. Very pretty, varsity cheerleader and all and we dated off and on for 5 years. While in high school we were dating for about 6 months and I was falling for her hard and I think she was doing the same. One night I got drunk and kissed a old friend of mine. I told her the next morning and she said it was fine and she was glad I told her. Then we started to fight alot more. We got in a screaming argument at school and it was extreamly bad, in front of alot of people, and she eventually cheated on me to get back at me. After that we went our separate ways for a year and never talked or texted, It was weird because we had never stoped talking sense I was 14 (im 19 now). So within the past 2 months I had started to talk to her again and we started texting again. Last week we "Hungout" for the first time and it was crazy. I have never madeout for that long in my life. We were so into the kissing I could tell she had me again. She says she just wants to be friends but she texts me all the time and is always wondering how my day has been. I like her alot but I dont even know if I should go back there again. Its like a romeo and juliet kinda thing my parents hate her and her parents hate me so we are always talking in secret. Its a crazy thing to be doing but I dont even know what to do. What should I do?