The reason why he was upset on the phone could have been that he either truly loves you and felt insulted that you have doubts about it (since you asked him if he was really sure about his feelings), or he has you for granted and hates the idea of you not following the plan.
Either way, marrying or staying in this relationship would be a mistake you'd regret.
You know what you have to do and you have all the right to do it.
*hug*

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