Aletta Vancouver (Doctor Who AU)'s Links
Roran was the first alien other than the Doctor that Aletta befriended! She had no idea that he would turn tragic due to their actions. Roran, however, is a very hard person to get close to, and she thinks he doesn't want her help. He seems to tolerate her better than the Doctor, maybe out of pity, which Aletta doesn't appreciate. She hopes Roran finds peace somehow.
It's a shame Aletta is infatuated with the Doctor. He could easily start a fight explaining everything that's wrong with him, but Roran doesn't really want to hurt her like that. He low key watches out for her when they're around, but in the long term he doesn't think it will matter.
The Doctor fell in love with Luke instead of her. Suddenly Aletta's future as she knew it has become skewed, and she knows she must one day leave the Doctor's side. The fear is all consuming. There is nothing wrong with Luke. He is kind, patient, and has been through so much. He reaches the Doctor on a level that Aletta realizes she never did. He is her friend, and she doesn't know the anxiety she is causing him with her grief.
Luke enjoyed hearing the Doctor talk about Aletta. She was someone that pulled him out of a dark place and truly made him happy. He wished he could meet her-- this smart, stubborn, fiery hero. When he gets his wish, it's in much more dour circumstances than he wanted, and now all Luke wants to do is disappear. Not only is the Doctor keeping the truth from her, she is already heartbroken by Luke taking her place. She doesn't deserve this. The Doctor doesn't deserve this. All Luke does is get in the way.