It's hard when therapists advice against a relationship. I found this true, sorting through my own stuff, it was tougher to have a more objective view towards that particular significant other because of emotional involvement.
All these years later, it's easier to objectify that relationship and comprehend why my therapist even suggested that.
I didn't listen to that advice, a year later, he cheated, went on-to marry her, she was wealthy--we'd both come from the same inner city. I believe her parents helped him obtain a masters. They divorced, and city talk showed me the way to a rather public youtube roasting of me, blaming me, among others of his issues. It was one of those stand up comedy things---the crowd sounded displeased. City talk, says it landed him in rehab.
Just sayin....maybe your T has their reasons to try and help you??