Jealousy is a really uncomfortable feeling. I know because I've experienced it to varying degrees at some point in my life.

I think that there's one word that you used that summed up your entire thread - you used the word assume.

Your life is living on "what ifs".

So you need to answer all the possible avenues of these "what ifs" scenarios.

"What if I'm my therapist's most annoying client".

- He's a professional; unlikely he'd take a form of annoyance personally
- He's trained to deal with all sorts of emotions from clients
- A professional therapist would not have favouritism with clients and like / dislike one over the other

"What if my therapist thinks I'm being protective of him?"

- He could take it as a compliment that you feel comfortable and confident enough that the advice and counselling that he has been giving you is serving you in good stead and that you would not want anything to end the counselling unduly because you are gaining from it

"What if my therapist knew about my jealousy issues"

- Therapists are trained to deal with so many scenarios
- The jealousy is coming from a place of deep insecurity - and this is exactly what your therapist is there to help you with
- If you tell your therapist how you truly feel - you can get some genuine help with some of the real issues going on here

"What if your best friend ends your friendship"

- Yes, this will be painful
- Yes, life does move on, slowly, when friendships fade ....

I'm going to stop there because I think you can see my point