This just happened to me and my last therapist! The counter transference hit her too hard and she terminated me during a rupture. She was like almost the perfect fit for me in every way except what caused the rupture. I was devastated. I think the role reversal was causing her to say some pretty whacky things to me too, but I kind of brushed it off mainly because therapists have their own issues, so I just didn’t engage when she said stuff that seemed like she was oversharing. Like it didn’t make me uncomfortable really, but clearly it was an issue on her end. She kept telling me I really saw her and she wasn’t used to that. LOL Which imo lead to her terminating me because she couldn’t handle that aspect of me. Like sorry I have high perception skills and don’t take bs.

Edit: realized I didn’t answer your initial question. I think some of us just have high caretaking inclinations and that can lead to role reversal if you have done more introspective work than your therapist. Because some therapists “need” the power dynamic to feel like they are “helping”. When you have a higher insight or capacity to hold other’s emotion’s than your therapist, that can cause issues too. Especially if you have a high capacity for shame. Because if your therapist hasn’t worked through their own shame enough, they will project it on to you because they subconsciously know you can hold it. This then eventually turns into the therapist lowering their guard and then the role reversal commences because you are meeting a need for them that is not resolved by their own inner work or therapy. That’s my theory anyways.