Is it normal for a 20y/o female to caress and stick to a 12y/o male
So this beautiful, shy young lady joined this boarding school I'm in 1.5 months ago. She was really shy on the first few days here but now we can have conversations with her, although she doesn't talk much. About a month in, she starts getting really close and playful with this 12y/o chubby boy(she's the initiator). She calls him 'brother' and says that he's cute, and would sit beside him and caress him(around hair and face) CONSTANTLY. She would be using her phone with one hand and the other hand will be stroking the boy's hair while wrapping him in her arm. The boy is generally passive and pretends not to want her affection.
It gives me goosebumps whenever I see her fondling the boy like that, but still I'm not sure if that's normal because I have a crush on her.
Is it just that I'm envious or could it be that she's paedophilia?