Re: ADDITIONAL SPOILERS LIKELY IN THIS THREAD
I believe that Tear cares about Luke, sure, but I also believe Tear is suffering from "I am a 16 year old girl and Luke is a reasonably attractive similarly aged boy whom I've been mostly responsible for for a few months here and I am attached to him IT MUST BE LOVE" syndrome.
But just. She spends SO MUCH TIME going "..van." and "Major Legretta" that I honestly don't think she has the ...focus to really *love* luke. Care about him yes! But the other two relationships in her life are sort of...overshadowing. ^^;