BeChange, just read your thread. Sorry you're here and going through this. I was there a couple of years ago, hearing the same type of thing from my wife. You've gotten some good advice already.
Remember, focus on you. GAL (harder right now but you can still start busy), 180 on any bad behavior, and detach. Remove all pressure and pursuit. Do not follow her around, do not start relationship discussions. If she does then listen and validate.
As LH alluded to, be ready for the other shoe to drop. Likely there is someone else. Look for the signs. More secretive time on her phone. Not letting her phone out of her sight. Etc.
Hang in there. Post often. We can help.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018