From the beginning the whole thing was a big joke to Luke , his friends and his family. ..just look at first episode when they were getting married.
I hope that Kate realizes his pining to remain married are just his way of manipulating her so that he can say he DOES want a divorce.
AJ --is a big baby and Stephanie needs to run because her whole life will be mothering this only child so he does not have a tantrum.
My opinion ...festering for weeks