Then lovingly put her back together so you can do it again later. Or, you know, she can return the favour. That's between each couple. I ain't gonna judge if neither is complaining.
Well...It's best if you just don't forget about your anniversary with your wife in the first place, but if you do...Well, just have sex with her until she becomes unable to think about it anymore, right?
Either way, just keep making her happy and you will have a blissful married life. Now, hopefully he does remember the 11th anniversary, and onwards.
I thought she said somewhere in her dialogue that they've been dating for 10 years, due to that I was hoping that somewhere later on in the story he'd propose and say something along the lines of "I think it's time we start a new anniversary" or something along that nature.
I agree though hopefully he remembers.
Do not underestimate the importance of the dating anniversary for a couple. My parents still celebrate this one as well even after being married for decades.