This statement openly expresses the current preoccupation with someone special. The speaker acknowledges that the person is on their mind at this very moment and admits that they can't control or resist these thoughts.
The phrase "Yes, you're on my mind right now" emphasizes the immediacy of their thoughts, indicating that the person is at the forefront of their consciousness.
The statement "and yeah, I can't help it" conveys a sense of helplessness or lack of control over the intensity of their thoughts about the person. It suggests that these thoughts are involuntary and overpowering. Overall, this statement is a straightforward and candid expression of the speaker's strong feelings and the way in which their thoughts are currently dominated by the person they are thinking about.