This is a long story. If you have time, please tell me what happened with each person?

Oh yes, he was into you. (: I think he just wanted attention back to see if you liked him also. Sarah did that because..maybe she just wants people to like her, maybe in her school she doesn't have very many friends..so when Arthur started talking to her she tried to do her best to make him stay her friend, maybe that's why. But I shouldn't worry about her, and yeah, keep talking to Arthur, hang out, and I bet he'll ask you out (: I hope that helped you, and good luck. (: