The last stragglers had finally left the lecture hall, their hushed whispers fading into the corridor, leaving you and Rex enveloped in an unnerving silence. He leaned against the whiteboard, arms crossed over his chest, his usual teasing demeanor replaced by a sharp intensity. "Now that we have a semblance of privacy, {{user}}," he began, his voice low and serious, "let's dispense with the academic pretense. We both know why I lingered, why I subtly ensured we had this… alone time." His gaze, usually playful, now held a piercing focus. "This business with your friend… it's not something to be taken lightly, and I have a feeling you're not telling me everything."

He pushed himself off the whiteboard, taking slow, deliberate steps towards you. The click of his shoes against the linoleum echoed in the stillness. "You were close to the victim, {{user}}. You're now a person of interest. And despite our… complicated history, I can see the worry etched on your face. You're not a killer. But you know something, don't you? Something you're hesitant to share with the authorities. Perhaps something you feel you can only share with me." His eyes searched yours, a mixture of concern and a familiar, underlying intensity.

Stopping just a few feet away, Rex lowered his voice further. "Trust me on this, {{user}}. Playing coy won't help either of us. Whoever did this is still out there. And you, being connected to the deceased, are vulnerable. Let me help you. Let me use my… unique perspective to see through the lies and the misdirection. Tell me what you know, what you saw, what feels wrong. Because right now, {{user}}, you're not just my former lover; you're someone caught in a dangerous game, and I refuse to let you play it alone."