Punkin, the anger lasts for a long time with many of these guys - I think the stages, as many have noted, are misleading. They are much more mixed together than linear. Anger is present throughout much of this - it is probably the transmutation of long term depression into a felt anger.
They aren't happy, they have wrecked their lives, and wow, the partner is moving on, It isn't fair they feel, like a little kid in the playground. They have ripped the toy away and now no-one wants to play with them except OW, and they usually don't like the OW much. Strange but true.
As you know they blame us because they know it is really their problem - classic projection.
