This is just my theory but I'd say the reason you are still comparing yourself to him is because you haven't let him go yet. I think that if you are thinking about how his life is better than yours - it is stopping you from recognizing the value in your life without him.

I also think that when we start to imagine that other people's lives are better than our own we are often seeing their lives through rose coloured glasses. However great you imagine his life must be it is just not reality and your life is not more or less meaningful than his.

Anyway, that's my two cents, I hope it helps. Have you been feeling any better since you posted this originally?