have i been making mistakes too long part 7

[tkdmme]

Ok, There has been a turn of events. Just to recap my situation.
My w moved to her mother's house with the kids. I have been getting the kids every weekend and it has been working out just fine. My occupation sometimes requires me to travel and up until yesterday, I was going to be moving out of town at the end of March for a new project. My company pays a perdiem to cover any expenses such as food and housing.My W was planning to move back into our house once I was gone.
So yesterday I was informed by my company that I would not be going out of town and I would be placed on a local contract for the next 18 months.
I don't feel like I should have to move out of my house. I pay for it and it was her decision to leave. I do however feel bad that my kids will have to continue to live with the W at her mother's house if I refuse to move out. I would love for them to be able to move back to the house where they grew up but I did not put them in this position.
Also, how to I go about telling the W? I already know what will be said. She will want me to find another place to live so that her and kids can move back home. When I tell her that I will not be moving out she will accuse me of being selfish and keeping the kids from moving back home.
The kids can move in with me at anytime but she is not welcome unless she is willing to give the M another chance.

I NEED SOME HELP WITH THIS. Am I being selfish by refusing to leave the home?