I could be wrong, because I wasnt in the marriage with you - but perhaps it wont be such a hard thing to admit you made a mistake leaving your marriage. Perhaps you married too early and the absence of other experiences led to a lack of appreciation of your ex and you wanted different things ( big issue). Regret doesn't mean you are weak or in validating your truth. It's just what it is. You left a good man because at the time it was the right thing to do and now you look back and life is life, not perfect. I admire your courage but I think some of the people judging you are not doing so because they are bad, they are also judging themselves. My sister recently told me she left a good man because she was too young at the time. Simple.