How do i overcome this situation?

Well it was a pretty bad relationship,I ended up finding out in the end everything was a lie.This person portrayed themself as a religous saint that does no wrongs.I believed every word this person said.So no I feel like I lost everything,I lost it all for this guy.And I feel like this biggest fool,and also he basically put this all out there.Meaning my reputation,and made me look like some crazy person that just wants him.But I should of known cause thats how he made all the girls look like,his past relationships.So I feel very down,and dum,not knowing if Ill ever get that real religous person,not some fake who just pretended to act like me.The thing is its been a while I havent spoke to this person,but I just saw him the other day,and He was like smiling,flirting with girls,kind of like tormenting me emotionally,since he knows how I think.And i dont know how to p it I think about it all the time.I just dont know how do I forget that when im worried about how my lifes gonna be.He affected me alot,and hes getting to me emotionally,but I know thats what he wants.