It does sound like you are holding on to T1 and how you see/feel about the relationship. Since there is no relationship anymore, no interaction, it is basically all in your head (fantasy) as there is no feedback from the outside, the other person. You can always care about/"love", think about T1 but by this time you should be facing more forward to your therapy now, in real time. There is nothing useful back there with T1 other than memories. Concentrating on those memories and thoughts of T1 uses energy that could be freed up to live your life now.