Hey Natus, the only way to detach is to literally not care about what she does and where she goes. If she really cared, she'd actually have wished you happy fathers day.
As for the space that you're in... well the way i see it, you have obvious choices regarding your MR. You can throw your all into it and fight for it. But ask yourself, what are you fighting for?
If you're fighting for a good woman that you know will bring you happiness, then you fight.
If you give up on it, then know that what happens to us are all in God's plans, we just don't really understand it until we take a real step back and look at whats happening, who we've become and where we're going.
Figure out what you want in life. They say that just the idea of putting your foot out of the door, means that you're already out of the door.
Just cos things are going right, doesn't mean that they were always wrong.