Yup, underneath , the conversation is about the legitimacy of doing work in attachment theory/ anxious attachment v the T being worried you use romantic loves/ crushes on your T's to avoid your real life, and not wanting to be the object of that because 1) it is bad for you 2) he saw you do it with MC and discussed with MC and mediated 3) you are likable and he might be tempted to relax his boundaries 4)he is getting nudged outside his comfortable scope of practice ( which you asked from day one) 5) Any countertransferance he has about being loved/ focused on . And Actually I cross the line in my head now and then- even though I adore my SO more than my T, there is something about the "I love you I don't love you tell me more how do you feel about me in the room right now peek a boo ",The Relationship stuff, that is preoccupying . The T's make it happen, then don't want it - in a way.