Put a huge PMA-ful smile on my face, and keep it there.
Tell her I am sorry we had a misunderstanding, and that she is of course welcome to do whatever she wants for her birthday.
Told W I was sorry that I went on at her about her not including me in her birthay plans. That was met with silence. I told her I was just a bit annoyed, cos I felt left out. Well she replied that I went about it the wrong way. To which I agreed. Then she had a mini rant about "another birthday, another argument", caused by me. [Yes, I can see my part in all of this]. But I told her can't you see that it's a good sign that I want to be involved in your birthaday. To which she agreed. In the past I used to, well... not take much interest in W birthday as a way of getting back at her. But hey, I'm a changed man.
Well I can't say that I'm not still peed that W will be in a Health spa on her birthday instead of with me and D6, but D6 has some ideas about putting up some birthday decorations for when W gets home. Kids are great when they need to be.
Oh as it turns out now partners are invited to the party on Friday so W and I will be out with the rest of the family (some consolation then).