mindsin - I have a similar situation as you, but maybe twice as long now. I have gotten impatient and have thought the same things as you - I'm sure.
At about 3 months in, she said the same things - I love him, I didn't think it was possible to love 2 men......
I was pushing at the time - thinking that was the right thing to do - we went to MC and everything. It didn't "fix" anything and it probably hurt the situation and timeline. Later she said, she just wasn't ready to change things, deal with it, even though she said she knew she wanted to. She was just not in the right mind frame.
I believe if I was giving her the space and time to work through things back then - as I am trying to now, we may be in a better place. The pressure was just doubling the problems and I really didn't understand or believe there was nothing I could do about the A. Only become a better person for me and potentially for us.
Yup. You, me, pilot, and one other person here have almost identical current situations, but my past is very different in that I betrayed her multiple times by my selfish acts of betrayal to meet a need that my W was not fulfilling.
I have a tall mountain to climb.
M: 15 years BD: 6/25/14 EA/PA: starts 5/14/14 11/30/14 - A ends 5/15/15 - D is finalized. 11/28/15 - Start of new LTR with a wonderful woman (and still going strong)!