If only she could be so oblivious again, to feel such love without knowing it, mistaking it for laughter.

The line expresses a longing to return to an earlier, unselfconscious state of feeling—when love could be experienced directly, without the self-awareness that labels it, questions it, or makes it vulnerable. “Oblivious” suggests innocence and protection: not knowing what one feels can allow the feeling to remain pure, playful, and unburdened by fear of loss or rejection. The idea of “mistaking it for laughter” frames love as something bodily and spontaneous, close to joy, before it becomes complicated by knowledge. Implicitly, the speaker is now in a later stage—aware, reflective, perhaps hurt—where naming love has made it heavier than it once was.