Sounds like you went to the wrong person for support. If he didn't support it before it must be tough for him to admit that he was wrong and you are doing something terrific by following this WOE. Therefore his reply did exactly what it was supposed to do--put you in your place for having done something he didn't agree with anyway. He wants you to feel like your effort is wasted and it sounds like he is succeeding.
Not to say he is a bad guy but he does have his pride. Bottom line is you need to be happy with your life choices for your reasons and not go to others for validation. Easier said than done I know. But if you want and need the external validation go to a supportive other or this board or some other place where people appreciate your efforts and accomplishments and not to those who never "got it" in the first place because they will never get it and you are the one feeling deflated.
By the way, I am VERY proud of what you have done and know what has gone into getting there. So give in a mental "what does he know anyway" and forge onwards.