First get clear on what you want to create here. You are undecided which is why your ex is behaving as so - because he's not sure what you are wanting either. Get clear on that first and then follow the energy that shows up.
No right or wrong - and you aren't the first person and won't be the last person to be unclear. It just helps to get these reminders. Its amazing how much more defined things become and more ease when you are clearer about what you want to create. I've done it myself 100x. So share because it helped me when I learned.