Yikes. Somehow, an emoticon like ":(" doesn't capture the pain I feel for you.
I've been through a similar break-up at a low point as well, so I understand the pain.
Someone in this thread suggested going physically far away. There's a great aphorism in Latin America which, translated into English, roughly means, "no one's a prophet in his hometown." Going far away gives you a bizarre super-confidence and super-powers, since what was simple and obvious in your own world that you're comfortable in, suddenly becomes insightful and smart. So I second the suggestion someone in this thread made, of going far away! (Hello from South America;).
More abstractly (the following point isn't about you anymore; this just got me thinking), questions like this make me think: I sometimes feel that people don't talk enough about the risks of the startup world. They all sound so theoretical: oh, you could potentially lose money or friends... but no, that won't happen to me! The reality is... it's a "superstar economy," no different than being a soccer player or a rock star. Mark Zuckerberg as John Lennon (maybe Dustin Moskovitz as Paul McCartney? Ha! Maybe Eduardo Saverin as the famous "fifth Beatle" who left before they took of hahahaha!!!!!). We all instinctively understand that, okay, if my friends and I start a band in our garage, there's a 0.000000001% chance we'll end up successful - okay, so eventually you grow up and get a real job, and stop the band once we go to college. But yet, it's so curious to me that, when we want to start our own company in that very same garage, for some reason we think that we are much more likely to be the next Mark Zuckerberg, that the chance is more like 1% than 0.000000001%. We think we're not like the annoying cool kids in high school, but actually, within our own circles, we see the same patterns emerging: everyone, it seems, wants to be a superstar. Oh human nature!!!
My unsolicited -- and probably wrong so ignore away, I don't know the actual stats etc! -- instinct is the following, and I apply this to myself (and this works only for myself so it might not work for you, everyone's different): when I'm evaluating whether to jump into a project, when I'm evaluating whether to completely run with it and see if I can be the next John Lennon or Mark Zuckberg then, I would treat it no different than buying a lottery ticket or casino game that would be partially a game of skill but mostly a game of chance. If I feel like I'm in a position where I think I can afford to lose a lot of time, friends, and money (since I'll likely lose all three!) -- then I would go for it. But if I'm not in a position where I think I can afford to lose a lot of time, money, and friends, then I just wouldn't go for it. Or I do it as a background project on nights and weekends and see what happens :) So it's about your own evaluation of your own situation more than anything else.
Again, just because this sort of analysis works for me, doesn't mean it would work for you: everyone of us has different levels of risk tolerance, financial situations, family situations, etc. Even issues as basic as age: it's easier to be 21 and lose everything than to be 51 and lose everything, etc. They used to say Rome of antiquity, naturam expellas furca tamen usque recurret -- you can push nature away with a pitchfork, but it'll always come back!
Okay now time to listen to Janis Joplin's Me & Bobby McGee. Freedom's just another word, for, 'nothing left to lose'...
-morgan