I screwed up again

[AnotherNightmare]

Beth,

Unfortunately my positive feelings and happiness went away in less than a second just a few minutes ago when I found out my instinct yesterday was right. My W did meet OM yesterday.

I am not sure if I am just disappointed or furious. She has the nerve to let me book her flight to her lover. I am really torn if I should still work on this M or if I should burn it down in flames and move on. She also expects me to pick her up from the airport next Sunday (well, I kind of offered it to her). I am not sure I want to do that right now. My S8 has a cub scout meeting at the same time. I have not told him yet that we need to cancel, and I am wondering if I should simply tell her she needs to find somebody else to pick her up.
How can people be so cold-hearted and pursue an A while their aunt is dying and their S is sitting at home watching the kids?

She does not know I found out, so I am looking for advice what I should do. Confront her, kick her out of the house, maybe even file for D myself? Or true to the DB philosophy just keep doing what I am doing?
I know I probably should not even have tried to find out, but it cannot be undone. And to be honest, initially I had not a bit of hope that I would be able to turn this around, so I started collecting evidence (I guess I still am).

Anybody's thoughts are welcome.

AN