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It's not wishful thinking and quite common actually. Here is what you have to keep in mind while she may be second guessing herself you won't be able to talk, discuss, or debate her into changing her mind. To her everything you say is against her interests and the more you pursue the more she'll run.

Instead like we say around here a lot, be the husband only a fool would leave. So start being the man you want to be, take charge of your life AND your family. Be strong, confident, and independent. Don't tell her why she shouldn't leave, show her through your actions.