What does “hear a bell ring” mean here?

Native speaker’s answer
Rebecca
Considering the romantic nature of these lyrics, "hear a bell ring" is reminiscent of the idiomatic expression "to hear bells ring," which means to envision marrying someone (i.e. hearing wedding bells). Thus, we can assume that the lyrics "one look and I hear a bell ring" to mean that she is falling in love very quickly. Ex: He's my ideal type. I already hear bell rings. Ex: The minute I saw you and your boyfriend together, I heard the wedding bells ring.