See if you have to ask how you should ACT on your date with an ex then it MEANS you have not changed enough to give it another try. That is exactly what we have been trying to tell you.
So either you are going to go
And blow it again and she may not even give you another chance
Or
You are going to go and act and do everything okay where she figures she will
Continue with you and see where it goes and you will eventually blow it.