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I bet the decision to leave the recent ex-boyfriend actually came 3 months ago. It just didn't become clear until recently. If you keep thinking about ambitions, your own and someone else's, eventually you internalize it as an important consideration and act on it. Now all of a sudden other considerations start to appear. It doesn't mean that the decision itself was right or wrong. I can understand though that it can be upsetting when you realize what you are doing only later, but that's how most things happen in life.