Many of our WASs leave and never come back because: 1) they are stuck in the loop of believing that they will never get their needs met in the old R, 2) they were "trapped" in their old R and so the best solution is to wipe the slate clean with a new R, 3) they are lazy and don't want to do "work" because love shouldn't be hard and 4) they suffer from low self-esteem and need to be constantly validated for their actions by the OP. The low self-esteem is the reason why many blame their LBS for their troubles. It's too embarrassing and shameful to think that they had a part in doing it themselves.
I would add a fifth to that:
5) Many do not want to do the scary and difficult work of squarely facing their emotional issues.
Looking oneself SQUARELY in the emotional mirror AIN'T fun . . . for ANY of us. I was willing to do it immediately, but my wife is JUST now beginning to, after years of avoiding her issues.