...Need your opinions.. What if..

You are in a relationship, and suddenly... your boyfriend confessed to you that when he is courting you.. he doesnt really love you at all(maybe only infatuation), it turns out he is just playing around with you. He cant move on, on this girl (which appears my BEST FRIEND) The worst part there is when he told me He already given up on my bff... that Im only the one he loves. But then he told me that Im really the one he loves..(which is not true)
Im hurt so much :(
Actually this happened a long time ago and it took for meto realize how stupid I am for still accepting him.. But Im still confused

* Up until now he always say he already given up on my bff but I still dont believe him because He is always concern about her :(*

Would I stay or would I Leave him?
NOTE: still love my BFF nobody can replace her, I love her!!! :<