I agree with CG. Something went wrong with her wonderful fantasy of living the exotic life of luxury in a foreign country with her lover.
It could be he dumped her, could be the job didn't pan out, could be financial... or it could be you finally putting your foot down on her neck and making her realize that there is no way in hell you will let your children leave the country.
Who knows, who cares. She is a lying, deceitful, cowardly and fogged out irrational creature. Trying to decipher and understand it will only drive you insane so stop doing it.
Keep moving on Mr Future Rock Star... there are new women on the horizon. Keep your eyes focused on the correct objective.
EDIT: Additionally...
If OM dropped her she is following plan B. i.e. Drop Future a bone and have him come yapping back like a good puppy. Keep stringing him along to get what she wants until a better option comes along. It's called survival instinct.
