I have an answer for my own personal situation.
Ostrich-Boy (aka H) never stepped up to the plate of life to make decisions while he was in our 20 year relationship.
He was a follower, not a leader.
In our case it was so drastic that I brought him with me to my therapist to talk about it.
He actually said in the session - "I don't mind not making any decisions, I am the support crew once a decision is made."
Soon after that I convinced him to get an IC. I assumed he was working on stuff.
Well, I guess he got to the point in his life where he recognized he wanted to make his own decisions.
So what decision did he make?
That he wanted this other woman from his past.
OB thinks he has "made a major decision" and he most certainly has!
The problem is, he still hasn't learned, as far as I can tell - (and TBH I have a very limited glimpse into his new life) how to be responsible for making decisions on an ongoing basis.
He actually said - "I love my new life with OW. she is taking care of me."
OMG!
Yup Big Bird - you are right back where you were before - letting someone else pull the strings. Only you are so wrapped up in the newness of it - you don't see it for what it is - same old behavior, different person.
Had he stayed within our marriage I would have happily encouraged him taking the lead a bit more - I was tired of driving the bus all the time.