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

Obsessing about clients outside of work hours.

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.

Do you regret being married to your current wife?

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

Off the top of my ancient head:

General Introduction to Boundaries from Panahi Counseling:

Trump attends UFC championship fight in New Jersey, taking a break from Musk feud for cage fights - AP News

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

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

Serious disappointment when the client cancels a session.

'AI scientist' discovers that common non-cancer drugs, when combined, can kill cancer cells - Earth.com

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

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

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

Why do many people think that Japan is not a gay-friendly country whereas 72% Japanese support same-sex marriage (the same number as in the US)?

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