It would be pressure if you sat next her and said "why are you leaving me" or something along those lines.
I treat my ex like a business partner. We will sit together at games and events.The product we are selling is my kids future. We will discuss together everything we need to discuss to ensure the products sells. We may also occasionally discuss the weather and I will even joke with her sometimes. Once in awhile things regarding family members but I will not discuss with her intimate details of my life. Those days are over. Not her business anymore.
It's going to take a long time before you will feel comfortable around her again but it will happen at some point.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712