Your daughter is the center of your world, not your ex.
Your daughter will suffer if you become involved in push/pull with your ex.
Focus on that and put everything else on the back burner
I agree with this in the short term. However, let me add my views in the long run:
You mentioned that you two of you tried to date again, but from what it seems, things are not much better this time round. Before you agree/ try to date again (if you are open to that), you must first have a think about what went wrong previously, and what can
you do to change dynamics this time round. Also, it is also worth thinking about your values, and therefore, your boundaries. When you're in a relationship it's harder to think about those.