Mafalda's "Crushing" is about a speaker who has fallen for someone they feel they shouldn't. The guilt shows up right away, and the repeated words at the ends and starts of lines (feeling, guilt, crushing) make the opening feel like a thought loop the speaker can't escape. The person is "off limits," though the poem never says why, so the reader is left to guess.
The speaker is honest about how silly the cause might be. They say they fall for nice guys, and that this person was kind to them just as he is to everyone. Still, they suspect he "must have done something." The central struggle is head against heart: the mind says no, the heart says yes. That conflict "kills" the speaker but also "keeps me going."
The mood is anxious and confused, with a hopeful streak. The last lines are the most telling: the speaker wants the crush to end, but also wants it to become something more, and doesn't hide that contradiction.