TEMPE, Ariz. – She looks like the girl next door; she's an Arizona State University student who volunteers in the community.

Now she's behind bars after police say she set her boyfriend's condo on fire.

It happened in Tempe near Southern and Kyrene.

Police say they're not exactly sure what set Claudia Drinnan off. Witnesses told officers she was mumbling about her boyfriend cheating on her when she got to his place at 1:30 in the morning.

He wasn't home, and that's when investigators say she started a fire in her boyfriend's room.