I've been with my T for nearly five years and have had all kinds of feelings towards and about him in that time. (like, ALL THE FEELS). I have worked with an adjunct therapist on several occasions, when my feelings were confusing, or I felt like they might be getting in the way, or when I worried that staying would only lead to more hurt, but I was too attached to leave, etc. I found it helpful each time. I basically processed my therapy relationship with these other therapists and I learned and grew a lot in doing so. My primary T knew about it each time, was supportive, and actually referred me to the other therapists. I'm willing to share more details about this if you want, but would probably be more comfortable doing that by PM.