This is America, anyone can file a lawsuit against anyone else. Filing a lawsuit doesn't prove anything except a person is disgruntled in some way, and/or is looking for money (see any personal injury lawyer ads lately?). I find it interesting that someone (and unless you've read the allegations in the lawsuit, which you can at the local courthouse) didn't also file an ethics complaint with the relevant board. Perhaps the lawsuit isn't by a former client at all. Perhaps it's a slip and fall, or the guy who cuts the lawn didn't get paid. If the lawsuit is by a client, seems a little shady s/he didn't also file an ethics complaint, but there ain't no cash in that.

"Torts" laws vary widely state by state for psychologists and for everyone else. What is "intentional" in one state may not be in another.

This suggests to me that you are willing to make a lot of assumptions to not trust the T you are currently seeing. Signals a new one might work better for you, and good luck with your search.