Revolution 1

I dont understand why Andi is so upset over something that happened to truman. What happened to him? Why did this make her give up on school? I think that whatever it was it had to be serious for her to give up like she did. I also want to know what the key has to do with him. It clearly has a special value to Andi if she didn't anyone touching it. I also think she is probably suicidal if she She is talking about how she likes pain.