What are some signs that a therapist may have poor boundaries with their clients?

Off the top of my ancient head:

Session-expressed curiosities about client details not relevant to the therapy.

Failing to mention the client in supervision/consultation, out of fear the supervisor/consultant will advise return to ordinary healthy boundaries.

Why am I not getting any atheists to debate with? Are they scared?

Disclosing feelings, fantasies, and experiences to the client in ways not related to the work the client is engaged in.

Serious disappointment when the client cancels a session.

Routinely going over the time limit with certain patients, compromising the time for the next client.

Why do old men think young women and girls would want them over guys their own age?

Sense of competition with persons who are important in the client’s life.

Frequent phoning or texting of clients to “check up on them and make sure they’re OK.”

These items can happen fleetingly, briefly, in any therapy, but if they’re frequent, it’s definitely time for the therapist to get some good, solid supervision/consultation.

What do you do to make yourself sleep early?

Obsessing about clients outside of work hours.

Eager anticipation (or anxious anticipation) of the next session in ways that distract.

Struggling with fantasies of deeper connections with clients, whether sexual or parental or other intense or intimate relationships beyond psychotherapy.

What thing happened to you as a child that you haven’t let go of to this day?

General Introduction to Boundaries from Panahi Counseling: