I am angry because the woman I love has chosen a path in life separate from me, and I have no control over it. It is okay to feel anger. The anger itself is not the issue, it is what you do with the anger you feel. You can choose to ignore it and stuff it down, but this could end up making it come back even more powerful the next time.
If you accept your emotion, and find a healthy way of coping with it, then it loses its power over you and you can healthily detach from it when you need to.

I accept that I am angry and that I cannot make someone love me. I am coping with it by using breathing exercises and trying to observe the feeling from a zoomed out view of myself. To see the whole issue and get a better picture of it. This is but a moment in the timeline of my life and if I look back I can see all the GOOD along with the bad. If I look ahead, I can imagine all of the GOOD that is coming. These feelings are temporary and will pass. This time of my life does not determine who I am, it does not have control over me.

M: 29 W: 28
D: 8 S:1
M: 10 T: 11
BD1: 8//15 (physically separate)
Back together: 4/16
BD2: 3/18, physically separate 6/18)
Here we are again.