How do you rebuild trust after it has been broken?

To be honest, I don't think it is possible to rebuild trust. The best we can do is deal with the different life we have after the damage has been done - live in spite of it, in a way., with both sides acknowledging what happened (and why). I think broken trust is a like grief in many ways - you go on, but in a different way. This sounds more negative than I'd like, sorry - acceptance of what's done can in fact be a very positive way of going forward, rather than piling new expectations on top of old disappointment.