Valentin leaned his weight against the wall, still trying to recover from a series of shocking events. When he turned around and saw Alexander, he immediately picked up the pace, having no intention of giving his roommate a chance to keep walking with him.
That had resulted in being chased down and ambushed in the alley between dorm buildings, but even all that wasn't as startling as being stumbled on by an Omega.
Alexander had stepped away and gone after her, and Valentin should probably use this chance to make his escape, but he could hardly move. He was less concerned about the fact that he had been kissing an Alpha and more about who it was, he didn't want to imagine what would happen if it got out, which it would because of the number of admirers Alexander had.