Red flags:

1. not a member of the APA, ACA, or ASA depending on their licensure.
2. implies, at all, that they are the only one who can help me.
3. overpromises (I'll never leave you)
4. and, at this point, if I find anything very strange about them online (e.g., my exT left his wife and severely disabled child and isn't involved in his life.)

Other than that, I knew I wanted someone who had experience doing adult attachment work. I didn't want to be their first attachment work client. I knew I needed to be able to contact between sessions - even if that requires paying for it. I also ran my new T's name by others in the psych community. In fact, I was referred to him. And, I just...make sure we click, mostly.