SL, Just about every sitch you'll see here begins with a "bomb" where the WAS declares they have decided they are leaving and that there is no hope for reconciliation. That doesn't necessarily mean it's set in stone - often, they are telling themselves and you that in an attempt to ease their pain. The only way to know for sure is to proceed on the assumption that the relationship IS salvageable.
Having said that, your primary goal must be to work on YOURSELF. The relationship will or won't work out - but you have to change who YOU are in it first. There's a great thread in Newcomers about this called something like "What These Boards Mean to Me".
Good luck!
Thread #10 22 year M, MLC, Piecing since 1/07 Goal: Live with confidence & enthusiasm!