Characterization of Leonard in Solitude

In the following excerpt from a novel, a character named Leonard stands alone in a café, observing the people around him. The narrative delves into Leonard's thoughts:

"Leonard sipped his coffee slowly, his gaze drifting from one table to another. He watched the couples animatedly discussing their upcoming vacations and the group of friends laughing together, their voices rising and falling like a melodious tide. Leonard felt the weight of solitude pressing down on him, yet he couldn't determine if it was the absence of companionship or the suffocating expectation of social interaction that caused him discomfort. Each chuckle and shared glance felt like a reminder of his own insignificance in their world. He found solace in his coffee, his only companion, a silent confidant that offered warmth but no conversation."

Based on this passage, which of the following statements best characterizes Leonard?