Its only a theory but suppose H can only stay for as long as his conscience allows him, so he stays until he starts feeling guilty or the reality of his situation hits home and he then runs for cover..
As for his birthday, give him a call and say you are having a birthday dinner in his honour and if he'd like to join you and the kids he would be welcome, but make sure you have that tone in your voice that says and if you dont we will make a nice time of it without you! Anyway it wont hurt if he has a thoroughly miserable birthday maybe it will give him some food for thought.
Chin up youre doing good even though Im sure it doesnt feel so!
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W 47 H 47 M 24 T 30
Once lost but now found and happily married again!