Hey darlagdo manche,

 I think whatever happened to your best friend has already happened. Now nothing is left other than remembering the way he innocently trusted the girl. As mansion said, we can't blame a person (the girl) with the only reasons that's apparent. She may have other reasons that made her so. Unless and untill one doesn't knw the truth behind her behaviours and actions, it is not good to blame ..

Your best friend should be strong to forget wat that girl did to him, coz it will only leave pain and regrets in him. As u said your friend is blessed with a wonderful kid and wife, he should rather focus on his beautiful married life, coz his family is the ones who he shud love and trust 100% . If he starts to think about that girl's deeds and her life and others, then it will be a waste of time for him, coz its useless crying for one who even doesn't care his feelings. Forget the past, and live for the present-his wife, kid and he himself.

And Its your decision to ask or not ask the money, but i think it will just shatter his married life and even the girl's if their family come to know about their past love life. Everything goes round....Its just my opinion.