Go.

Have no expectations.

I would say in general to let your ex control the contact.

Treat it as if you were going out with some aquaitance that you met on the street.
Nothing more or less.

I guess my question is why is this not appropriate?
What is it that makes you feel this way.
He is the father of your son.

Sorry if this answer is too late.
I just saw this post today.

Me-70, D37,S36