Some (disjointed) opinions:

You say you've had 4 other therapists which I think plays into your keeping him. My former therapist was a no touching guy (though I never asked) and I got so used to it that when my first try-out new therapist hugged me without asking I was very uncomfortable. He got that by my reaction and asked the next time, which I also didn't like because it was awkward.

I think it is a good thing that you've developed a relationship with your therapist as a new beginning for you. I think it would help, rather than hurt your developing more feelings for others.

The questions you asked him were totally innocent on your part I agree, but I think they are personal--what he does when you're not with him, and his thoughts and feelings about his profession (and also, by extension, his past).

I never met my therapist off duty in 15 years but if I had I would have said "Hi" first and kept going. I'm almost positive he would have followed my lead but not initiated. He also didn't contact me but let me call him. I adored him but I wouldn't have wanted him to text or call me out of session; it would have felt very intrusive.

I'm now on my third new tryout therapist. From your description I would definitely keep yours if I had him.