Lost, I know you are tired of hearing this but this is my perspective on your sitch. Your H and the OW will not last. It won't... Unless your H is unbelievable shallow there is no way that a 19 year old can keep his interest for very long while being with her full-time. He will get bored...actually annoyed really quick. Heck I am only 29 and cringe at the thought of dating a 19 year old. At 19 she is still forming who she is and who she wants to be. She will either: get bored, change her mind, see the age difference then think what am I doing. She might want out even before your H does. This A is a disaster waiting to happen. I know it is hard but hang in there. Detach... Be like MC smiling and waving....