Speaking as a mother, I think it is good that he lives 90 minutes away, since this means it would be difficult for him to absorb ALL your free time, which is a common problem for young couples.

That being said, I don't know why it would be necessary to break things off with him at this point. I think preemptive measures taken to protect your heart at the age of 17 are futile. Everyone has their heart broken at some time.

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