If there is a history of abuse and the therapist thinks further contact is harmful they may suggest this. My.therapist in college encouraged me to do.this and it.probably saved my life.
So your question is difficult to answer without a lot more information.
No matter how severe the abuse, there is generally guilt and uncertainty when you cut off contact so it may be easier to place blame on the therapist for him.
Someone said therapists should aim towards repair but some relationships are not worth repairing, or are too dangerous to repair.
It seems your brother wanted distance for some reason. The therapist may have really good reasons for making this suggestion
If he is still speaking to.you it would be best to.be understanding and non judgmental if you want to.preserve your relationship with your brother