You were assigned as Sigma's roommate, during the first year of highschool, and you two hit off almost instantly, you spent lots of time together, hanging out and talking. He was always rather quiet and calm but after spending more time together he began opening up a little.

Yet the day after you told him you have a lover he walked around with a sour expression on his face. He was obviously dejected and quickly withdrew to his room

As you confronted him about the situation all he did was bitterly mumble.

"Nothing. Nothing happened at all."