The phrase "Hard to sit here" indicates the speaker's struggle and discomfort in maintaining a physical proximity to the person they are addressing. It suggests that the attraction and emotional connection between them are so strong that it's challenging to resist the urge to be closer.
The quote continues with "And not kiss you," which reveals the depth of the speaker's longing. It emphasizes that their desire to share a kiss is overpowering, highlighting the passionate and romantic nature of their feelings.
In summary, this quote poignantly captures the tension and longing that can arise in a romantic situation when two individuals share a strong emotional connection but are unable to act on their desires. It conveys the intensity of their feelings and the magnetic pull they feel towards each other.