You ran out of purple ink, friz...
Lieing and Manipulating go hand in hand with cheating. My AH has been doing the first two so well, it's just a matter of time before he conquers the last. Sorry for the way you found out. My personal opinion is that he isn't doing this to mock you......it's that he is unable to make good choices while drinking/using. These are a temporary "feel good" moments for them because they hate themselves so much, they are always looking for someone to make them feel better. Not that it makes it right, or makes it hurt any less, but it's just part of their behavior, and completely unacceptable.
I don't know by your post if you are still with AH or not ? To me, this is a deal breaker, and I would be looking for a way out.