What should I do? Confused about my ex?

It is apparent that you guys still have some sort of rapport. The million dollar question is if it is strong enough to rekindle your romance. Though it is difficult to say specifically,it seems that there is a Chance here ,that there is some sort of a chance that you would be together. To know for sure requires you to ask him directly.Pick a day and time and have a talk with him,tell him how you feel and ask him how he feels,If you guys are on the same page,then you can start to build the type of relation ship that you want ,and decide how you both want it to be ---and fill the blanks. At the end of the process,you wil know l where you are and you want to or should know .I wish you all the best