How would you feel if your partner stole money from you?

My mom and her husband are going through a divorce. Then maybe again they're not. He lives elsewhere. So he got mad at her because he thought another man was at our house. A car was parked but it was his brother in law's car. So he took all of her money out of her account and told her "f*ck you". Then the next day deposited it back. They're thinking about talking again after that. I'm staying out of that.
How would you feel if your partner stole money from you?
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