I agree with anvil on this one - be thankful it was ONLY 13 years and you are getting out now. This guy sounds very sick - and not just with alcoholism. He cannot be trusted. He has made you sick.
You will have to force yourself to stop thinking and obsessing about him. I physically have to force myself to NOT think about certain things. I talk to myself; go for a walk/run; turn on the TV or grab a book - anything to stop the stinkin thinkin.
Who cares if he is depressed? This guy was inappropriate with your daughter. Every time I think of that I just cringe. I am hoping you do, too.