Hang in there man, I've been down that road, with my first wife, including the sleeping with a "friend" and her running up lots of bills. Let me tell you, get through the depression, whatever it takes, you will end up in a better place. I got thru and found myself so much happier after it was over it was unbelievable that I hung on that long(we had a kid and more that made me try and stick it out). Now its 7 yrs later, I just got remarried, relocated, and Life is so good. Hang on!!!!! In fact PM me if ya need more details or advice, anything.
"He was a wise man who invented Beer"--Plato