How do you tell if he sent if to you?

My friends, I have grave news. The apocalypse is coming. I got a flower from a secret admirer. My school allows us to buy flowers for people. All he did was write my name on it, no message, no who it was from.

However, I do have an idea. A guy from my class, L, said "Are you looking forward to the Valentine flowers?" To me. I didn't hear what he said exactly and asked "What?" He wouldn't answer, but told me to ask his friend,N. Makes me think N got it for me, but my friend told me that it's in L's handwriting...? Maybe N had L write it? Maybe L likes me? Maybe N? Please tell me your opinions!