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The LW and her original ex sound immature. The ex was younger, and she's only 25, so I suppose his trek to china was just an immature dreamer's move and maybe now he'll grow up and be stable.
The LW is a twit. Her recent ex was not overly jealous, he was justifiably concerned with her immaturity and fickleness. She did look down on him, she was in love with what she thinks is a "better man." Instead of triggering the response she wanted (2 men chasing after her), he responded like the smartest one of the 3 and dumped her. Now she is suffering the trauma of being dumped, even though she had no interest in the guy who dumped her at the time he dumped.
The LW is shallow, selfish, fickle, and immature. I;m sure she'll cry a little and then jump back in with her original boyfriend, and then get antsy when he gets too busy for her in med school. Grow up, and try to be a little less selfish.