This statement conveys a strong and persistent preoccupation with someone special. The speaker openly admits that they are currently thinking about the person and that they can't seem to stop these thoughts.
The phrase "Yeah, I am thinking about you right now" signifies the immediacy of their thoughts, emphasizing that at this very moment, the person is occupying their mind.
The statement "and no, I can't stop" suggests a sense of helplessness or an inability to control the intensity of their thoughts about the person. It underscores the depth of their feelings and the constant presence of the person in their thoughts. Overall, this statement is a candid and direct expression of the speaker's strong emotions and the way in which their thoughts are consumed by the person they are thinking about at that moment.