Should I leave my boyfriend for my ex?

Ok .... So my current boyfriend was texting other girls a while back and I caught him, he had dating sites trying to meet other women and everything, I've been trying to get over it and moved on cause he promised he wouldn't do it again, but it bothers me a lot like anytime he goes away on a trip or anything I'm just always worried about him cheating but recently I contacted my old boyfriend and it's like ... "Love all over again" (so basic but whatever) my ex never cheated on me, he just broke up with me and I never gave him a second chance. I love my boyfriend but I just don't want to get hurt again, and I love my ex but I just wanna make a smart choice , please give advice .