Difficult situation. Although "rehab romances" are definitely common, this might not be that situation. Due to the fact that she made the "love you" statement in group session with family members present, I would like to assume that this is nothing more than a friendly supportive relationship. Alot of recovering alcoholics (as one I can state) develop supportive relationships with others in rehab and in the rooms, and the term "love" is used in the supportive form. Although it doesnt make much since when stated, I guess there is a difference between "loving" someone in this way (like a brother/sister) and "being in love" (husband/wife). It's not uncommon to be told that "if no one else has said they love you, I love you" by a complete stranger in AA.