Need your opinion on on this situation...?

ight to mak this long story short, ive dated couple of girls durin school, but when i graduated i was gettin serious with this one chick and we talked all the time its a long distance cuz she lives 100miles from wer i do, so when i graduated we had this argument wer she told me she wasnt redy to date, shes 2 years younger than me, so we broke up it end watever but i found out a little later she made out with her bestfriend i got so pissed but watever we aint datin but she says she says she still wants me and dosnt kno y i didnt go afta her, i didnt cuz i jus didnt wana see her again. so ive been talkin to this chick for the last weeks a freind of mines for a while and been flirtin ya kno and i thnk if it continue problaby go out soon, but now im stuck wud u go back with ur ex that says she srry for everything or the new girl which never done nuthing mesd up and is older then the otha girl? btw they both look gud and i lik em both alot jus wonderin what wud ya'll do