Even if you get a condo, I wouldn't get the playset. It won't stop there if you do. It will be something else the next month. She has to learn to live this life she thinks she wants. Right now, it doesn't include you, so don't make things easy for her by buying things for her.
Be her friend, Russ, but you have to GAL and detach. I can feel you hurting. You don't have to date. That is hard but you have to start detaching. Focus on other things. I know that is hard without your kids. I know that helps me quite a bit. But you have to be happy for you. Don't let your WAW take that away from you.