What does it mean if a guy brings you flowers for your birthday but doesn't do anything after?

A few months ago, I (24F) invited everyone in my class to my birthday party. My friend, "Evan" (24M) agreed to come. Don't get me wrong, we are friends, but we're not super close, either. So he gets me a huge bouquet of pink roses. They're easily the most beautiful flowers I've ever seen. That being said, a few months have gone by, and he's done nothing else to indicate interest. We hung out with a couple of other friends tonight, and there was really nothing there to latch onto, in terms of romantic intentions. So I'm just wondering if he's just a very generous gift giver or if there was something more?

What does it mean if a guy brings you flowers for your birthday but doesn't do anything after?
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