At first I thought I forgot some major occasion (see the previous post about my poor memory) but when I looked at the card it just said, "I haven't bought you flowers in a while. I thought you would enjoy these." I do. A lot.
I joked to my coworker that he must have had some kind of coupon or discount. Then I called Matt to thank him and found out - his credit card offered double rewards points by purchasing them online. HAHA! I love that I know him so well. And you know what? I don't care what prompted him to buy the flowers, the point is that he bought them.