My Bestfriend's Ex Girlfriend

Cassandra Faith Dela Vega, a simple girl from the royalty family. We owned Royalty University, but nobody knows that.. even my friends. I've met this guy in our school since he, his friends and my boyfriend are friends. We get to know each other and I didn't know... I fell in love with him. But, some circumstances happened. Should I give him a chance? Or should I stay away from him?