I do understand that you want him to see that he is a fool, because you are such a fantastic person.

Becoming (more of) a person that only a fool would leave, is something the LBS does... FOR THEMSELVES... and NOT as a "show" (tactic) to win back the WAS. If the WAS happens to notice, they may change their mind and perhaps want to R, but it's not the LBS job to "show" the WAS anything. In the same way that an LBS cannot "fix", control, or "teach" a WAS.

Send your H a happy birthday message if you want. Only, though, to wish him a happy birthday, because you would do that with ANY friend. Would you wish a friend a happy birthday in order to show them what a good friend you are?