Can I be in love with a girl or am I just jealous?
What makes you think you're in love?
I see her everyday and we carry out experiments about this issue.
Give it a bit more time. It could just be infatuation due to close proximity.
I don't think so. I read a lot of psychology books and they all say that infatuation is one of the main indicators of true love.
Well I don't know your entire situation, if you like her try to ask her out? It is a risk that might be worth taking if she says no you should respect her wishes.