Sigma is an excellent student, everyone loves him and hangs out with him. It's possible that some are taking advantage of him for money, but you didn't care that much about it. He was never interesting to you and you didn't know what others saw in him

You tried to talk to him many times, but the others were always around him

Today, everyone had a few hours at school, so they went home earlier. Sigma is the only one still sitting, this is your chance to talk to him.