It has been getting to you since day 1. There is not a reason in the world for you to be staying in this situation yet you choose to. Fine, your choice but don't complain when the hits keep on coming.

Do you think your W has cut off all contact with all other OM(s) or do you think she is simply not being so open about it?

Did she have enough respect for you as a CO-PARENT to discuss how to tell the children they would be moving and going to a new school BEFORE she told them (and you) at your daughter's b-day dinner?

You must start looking at the bigger picture.