The speaker admits she has fallen for someone new, and she's almost embarrassed about it. Calling it "a foolish thing" suggests she already doubts whether this love is wise, even as she confirms "yes, it's true." The first lines sound like a confession, half proud and half sheepish.
She describes him in simple, warm terms: he's nice, he's beautiful "in every way," and he makes her feel good today. That small word "today" hints that the happiness is fragile and may not last. Then the mood shifts. She doesn't see him often, and the repeated "No, I do not..." sounds like she's convincing herself of a painful fact. The final lines hit hardest: "he's perfect... And I am not." The trailing dots throughout feel like hesitation, as if she keeps stopping to swallow her feelings. The overall mood is tender but insecure, a mix of giddy crush and quiet self-doubt.