First of all it is common problem in youngster. Most important thing is first both of you need to know each other very well.you worry about him that's mean you care him.but, You rejected him because of breakup; it will happen or not in future is base less decision. Breakup word is come from uncertainty of love. As I said above you should must be know eachother and then make a decision of future. If strong Understanding base is created by you and him, then there is no certainty of breakup.
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