I'm so pleased to hear about your friend and her H. What it tells me and should tell you is that if H is meant to in your life he is meant to be. Like you I wondered why wasn't I worth it? I have come to the conclusion that we are worthy, unfortunately we have met someone who hasn't got the same values as us and therefore weren't worthy of us in the first instance. Maybe our H were part of our life to show us that we are strong women and that we should believed in ourselves more.
Turn the table round, if you were still with H, would you have accomplished or even contemplating to do everything you have accomplished so far. Maybe it hurts because we blame ourselves for not following our gut feelings ( well it's my case) regarding H. Who knows?
What I can tell you for sure is that I have done thing I'd have never thought I was able to do if I was still with H. From reading your post it's the same. Embrace the new you and if it hurts maybe it's because we can't have what we want (even if we know it's not healthy for us).