Seems to me that this whole R thing is a 50 50 deal. so even if your money is seperate that doesn't mean that one should suffer while the other lives it up.
I understand your emotions over this. I read the letter and well.... felt icky. Both because of the subject matter and because of what you were saying.
I don't know that I have a better solution, other than how could you handle as a 180? Maybe when he suggests buying new bikes ask him for his help on how you can accomplish all the really important things you have in mind financially. As well as being able to share something that is fun for both of you.
Maybe just saying I would really like a model like you are looking at but I can't afford it. And leaving it at that.
Sorry I'm not more help.
