I (32M) have a weird relationship with my wife (36F) and it is killing me

Here comes a wall of text:
My wife had wanted to open up our relationship so she could experiment with her feelings toward women. I was okay with this as long as she was not looking to end her love with me, which she was not. (Mind you she did cheat on me two year ago with a woman I found out later about). This time she was upfront about it.
So September of last year she started this relationship with another woman who she knew felt the same. They are now in love, I slowly became ignored and as of the end of January I told her I wanted to get a divorce as it is clear she no longer cares for me, which she agreed and believes she is a lesbian. We have two kids.
At first I was fine with her being gone most nights, as she had a significant other, and I did not. We both work 40 hours a week, but over the last 5 months, it has turned into me taking the kids to everything they have going on, cooking every dinner, the sole cleaner of the house and of all affairs (bill paying, family things etc.) She has had since January and has not moved out yet. She is gone almost every night and I get 1, maybe 2 nights out a week if she hasn't already planned something. If I bring up her moving out, she loses it and starts crying. I am mentally and physically exhausted and at my wits end. I don't want the kids to see me being hard on their mother, my parent's divorce was messy and awful and led to a falling out with my father.
I dont have enough money for a therapist for myself, after making sure my kids get the help they need for sorting out their feelings on the divorce. Everyone seems happy, my kids are getting used to the idea, my wife is happier then she has ever been with her new love, and I am so miserable, I dont want to leave the house, and my wife cannot afford it on her own, but I know if I leave that it might make it harder for me to get it during the divorce (which we agreed to just have a mediator).
TL;DR: Wife has a happy life with her girlfriend while I remain her financeer, butler, maid, child care, etc.


Source.