Should I get back with my ex?

I broke up with my ex broke up bec I found out he cheated on me. It took me about a month to finally accept the fact that we weren't going to get back together. It's been two months and im dating this man that im really into to. Then out of nowhere my ex he calls me and expresses to me he made a mistake and wants to give our relationship another try. Should I still keep seeing the person I've been dealing with, or try to work it out with my ex? I just dont want to go through it again with my ex he really hurt me.