I agree w/Peace...you have to try to sit quietly and allow things to progress w/her. You need to keep the focus on you and your children.
I noticed she stated that you aren't her parent and yet, she wondered why you didn't text her. She is looking at you as a father figure and she is saying one thing and then something else.
Please, please stop talking to her about the OM. You are doing nothing more than pushing them closer together by doing this. The less you bring him up, the better. He is a band aid to her pain right now. He is probably fun, has no responsibilities and is listening to her tales of woe. I know it's difficult, but he not worth your aggravation at the moment. You've got to turn your focus on to your kids because they need you now more than ever.
Dig deeper for patience. If you stop and really listen to what she's saying, she just may tell you something about herself and what she's dealing with. We all have had to learn and dig deeper for patience, compassion and listening without offering advice to our crisis people. We are fixers and that is another area that we all need to work on...we can't fix them.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.