Getting back with an Ex

So I've been talking to my ex on and off since we broke up about 3 weeks ago for various reasons, arguments, living an hour apart, etc. We've been talking and snap chatting a lot more the past few days and it's been going good and have talked about hooking up and seeing what happens either getting back together or moving on. I know it's going to question us still having feelings for each other. We've agreed that we do not want a fwb relationship! It's not an option. Any feedback or experiences with getting back with an ex?