Whose to blame when you have a change of heart?

I have made a very bad mistake at the cost of my childhood friendship and potential future husband. We've known each other since we were 12, and now are 26. we never have been anything more than friends and decided this year to start a long distance romance. Because I had such a HUGE crush on him when I was younger, I was infatuated and enthralled initially about the idea of becoming his wife---but soon found that I really didn't have those "deep" feelings for him beyond just loving his as my friend. Well things HIT THE FAN yesterday, I had been telling/questioning him how would we have a relationship living 10 hours apart and BOTH of us being starving musicians. He wanted me to move to be with him but refused to entertain moving to be with me. I finally told him, that I couldn't continue in this make-shift relationship. He BLEW up. First he said he respected my decision but soon turned on me saying I had played with his heart and that I was immature. Yet, he still lives at home with his mother. And I finally convinced him to get his own place just this month. How am I to blame and being immature because I stopped this from getting any deeper...was I suppose to keep going along knowing I didn't believe in this union...?