Don (not his real name) approached me one day at the grocery store and said he wanted to see me for therapy. I had known Don for years. Don and I attended the same church. He shared the same interest in Zen Buddhism and a love of desert life. Don and I often had breakfast together at a local diner. He had never crossed a professional boundary in all the years I had known him.
When one works in a small community, it is not uncommon for friends and friends of friends to approach you publicly and inquire about car repair, aluminum siding or whatever your trade is. I discourage this since I am a therapist, and we have stringent rules about client privacy, and I might add our own.