There's a friend of mine—let's call her Lily—and a guy—David. Lily told me that she feels very happy each time she meets, talks, plays games, dines (and so on) with David. I guess she's falling in love. But she is very perplexed these days, because she likes him, but can't be sure—wants to but is afraid to make sure—whether David likes her or not. So she has decided to write something about that emotion, rather than telling David directly (thus prompting him to say "yes, I like you too").
Here is my question—for what perplexes her has also perplexed me:
In what Literary and Artistic way can she describe that emotion?