First, do you want her to come back to you? If so, then it sounds like if you want the relationship to work after she left due to a "crisis", then perhaps couples therapy or counseling is the answer.
If this struck you completely out of the blue, then it sounds like your relationship has had problems for awhile and you both were not communicating with each other very well.
Also, if someone just up and leaves and doesn't have the courtesy to at least tell you there was a problem in the first place...they have the problem and clearly aren't coming back at all, because they have been gone for awhile it sounds like.
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