Sorry you are man. I can relate, my wife told me last week that she doesn't love me anymore and has been unhappy for the last 6 years.
Hang in there. It is tough--It has been the toughest thing I have ever delt with.
From my short experience the best advice I can give is to give her space. This is tough as there will be a ton of thoughts going through your head. Work on some 180's. This has helped me and has changed my wifes attitude towards me.
Find something to do and focus on, if you don't you will drive yourself crazy. Try not talk about your relationship if you can for awhile. Whenever I do it seems to drive my wifer further away.
Hang in there man. I have to tell myself everyday to not give up and that my wife just does not know what she wants. It's difficult but if you want your marriage you need to hang on.
