Deployed Soldier/Father needs your help

[SoldierDad]

I know now I couldn't make her happy-hell I don't think anything could make my W happy. She even wrote that to me, that I couldn't make her happy, and now that she has started "dating/screwing" this businessman that flies into our city once in a while, she is happy.

The really hard part for me right now, is the detachment. I have read-re-read on detachemnt, but I am struggling with just letting go, and dropping the rope. I hope it comes with more time and effort on my part.