I am guessing that the un-Colleen-like thing is that she won't be honest about her feelings; I remember Jt using the word HONEST to describe Colleen to Lauren. I would say she has been honest with Jt for the most part.
Lyndsy did said that Colleen still love Jt, but that alot of things happen while she was away (those things can be Jt "falling in love" with Britt, Mac "falling in love" with Jt, and Jt's one-night stands
), and she decide to protect her heart. JMO!!
WDYT?!