This statement expresses a continuous and pervasive longing for someone special. "I Think About You Constantly" signifies that the person addressed occupies the speaker's thoughts without interruption.
The phrase "Whether It's With My Mind Or My Heart" suggests that the person is not just on the speaker's mind but also deeply embedded in their emotions, highlighting the all-encompassing nature of their feelings.
In essence, this quote beautifully conveys the idea of an unceasing and profound connection where thoughts of the person are a constant presence in both the speaker's mind and heart, emphasizing the depth of their affection and longing.