No I dont want to remain "bestfriends"

I have an ex who broke up with me to date some other girl who was more convenient. Ex is upset that I wont remain bestfriends with them and I cut off all ties completely. I was EXTREMELY hurt by this person and have no intentions of letting a friendship bud and this person doesnt get it. Its so easy for a person to hop from one person to the next. No grieving, no pain, no nothin'. Yet the faithful ones always get the shorter end of the stick. Anyways, just needed to blow off some steam. If you need an nice, decent person to talk to. Im here.