Our expert says:
He sounds like a very immature, over-controlling and insecure young man, and not a great bet for a secure and happy long-term relationship. It is a problem with a young person like your daughter who is reluctant to take advice, and may insist on making mistakes, before learning from them. You may have more success if you try, not telling her what she should do, but talking with her about these observations you have made, perhaps relating them to some of your own life experiences, and asking her what she thinks, how she handles his extremes of jealousy and controlling behaviour, and how she thinks this will develop in the future --- in other words, the conversation would be supportive and sympathetic and exploratory, helping her to think about these problems, and trying to help her to reach the same conclusions you've already eached, rather than handing them to her on a plate she will reject.
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