I would think it almost impossible for a T to remain completely objective at all times particularly with longterm clients. I mean they are human and can't just switch 'off' feelings'. Feelings are a natural part of being human and inevitably they will develop one way or another. I would think the important skills is in being able to identify their feelings, understand where that feeling is coming from (e.g past or present etc), process it and make sure it doesn't impact the therapy in that whatever they say or do continues to be with the clients best interests in mind. I don't see that a T would have to refer a client just because they felt 'love' or even a dislike for them unless they felt that they weren't skilled enough to handle their feelings without them negatively impacting the therapy. To me, that would highlight they need to do more of their own work and/or more training. That's obviously just my opinion though.