When cubes celebrated his birthday, neither of us yet realized we'd be crossing a milestone. We just moved in together and hadn't yet set a date.
When I celebrated my last birthday as a "single" we'd just decided upon our wedding date and chosen our venue. Again neither of us thought about it being the last birthday when I was "single."
Funny thing is that now that I know I've celebrated my last birthday as a "single" and thought about it some, I feel more excited about our next birthdays. The first birthdays we'll celebrate as part of a couple.
Did a milestone sneak up on you? Are there any milestones you're looking forward to celebrating together?