This statement expresses the transformative power of love. It suggests that the person addressing someone has had such a profound impact on their heart and emotions that they can feel a noticeable change in their heartbeat.
It conveys the idea that love has the ability to create intense emotions and physical sensations, symbolized by the change in heart rhythm. It's a poetic way to express the profound influence of this person on the speaker's life.
Overall, it's a romantic and passionate declaration of the profound effect that love can have, making one's heart beat differently when in the presence of the person they care for deeply.