3)OM's girlfriend is being a d!ck to her 4)OM got her pregnant and wants nothing to do with her or the baby
Well, tough luck for them....
As long as OM's girlfriend is with OM, she will have to deal with your wife. Also, OM has 18 more years to deal with your W because they will have a baby together.
Legally and financially OM will have responsiblities.
There is no arriving, ever. It is all a continual becoming.