SCULLIBUNDO
Banned
well i was kind of joking but from your tone it sounds like i might have. explain.
Whilst Damon's character had asked her to move in, it was more in a sense of adding her to the apartment than letting her add to the apartment. Like another accomplishment or ode to success showing how far he has come. This is shown in him asking her to leave her photo (read: baggage, who she is and her past) where it won't be seen - as that is what Damon has done with his own life.
So then when Costigan visits her whilst she's in the midst of clearing out the rest of her stuff and uprooting her life for Damon, he hangs the photo back up in a gesture that says the opposite (as Costigan himself would have to remind himself constantly to not forget where he actually comes from) which is sympathetic and more in line with Farminga's character.