Your most recent relationship had not lasted too long for you to decide how it would go on should you decide to remain with this person. On the other hand, you have more experience with the other individual and you've experienced both ups and downs and know what to expect most of the time.
If you feel that you are burned out from the previous relationship and that you fairly had given it a try many times, then it makes sense that you would want to move on and experience something new. Change can involve growth as well as risk taking. Think about whether or not you want to remain with the predictable relationship from the past that you worked on already or try something new.