How do you heal the pain of a heart break?

Went out with a girl for two months, rushed into things fast, she was high maintenance, fell in love, put tons of effort into the relationship, lacking of communication was one big deal, spent $800 on her for Prom, two weeks later, she tore my heart into a million pieces. She was a body of lies!! It's been over 8 months now, I still see her here and there. Every time we talk she always brings up something from the past, when she says something like that, it breaks another piece off of my heart. Now currently she is dating someone else, and that just makes me sick. God is the only one helping me piece my heart back together. But is there any other advice on how to heal this painful heartache!!