Here, the speaker thanks a close friend for reacting kindly when someone asked whether the two of them were dating. The friend didn't recoil or make a face, and even played along with a joke, which means a great deal to a speaker who was afraid of being hurt. The poem makes clear that the speaker wants more than friendship ("I'd love to be more") but doesn't push for it.
The feeling underneath is a mix of gratitude, nervousness and tender patience. The speaker replays their own answer in class, worried they said something wrong, and then admits they would wait "forever" if needed. The mood is warm, shy and a little vulnerable. Short, casual lines make it sound like a private note rather than a polished speech. It ends with a simple "I love you," leaving it unclear whether that means friendship, romance, or both.