Levi is perceptive enough to pick up that odd little expression on Diego's face, but he interprets it as Diego having third-wheel anxiety after their adventure in the woods. Because Levi hasn't been given reason to suspect that Diego might not be 100% hetero-- BECAUSE THEY TOTALLY GOSSIP ABOUT CUTE GIRLS DIEGO LIKES, RIGHT? AND DIEGO'S MYSTERY WOMAN HE'S BEEN PINING FOR IS TOTALLY A GIRL BECAUSE DIEGO USED 'SHE' PRONOUNS AND NOT EVEN THE VAGUE 'THEY'.