"I now know, that she has thought about getting a divorce for along time, without my knowledge or without me noticing the signs."
You said your W recommended going back to counseling and then you dismissed her and said she could go on her own. She TOLD you the signs. You just didn't care.
Do something different. Start engaging a bit with her. Slowly talk to her and then slowly increase the time of the conversations. Make them light and about her. Ask her how her day was, etc. Start from there.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.