Thank you all so much for your replies!

This is excactly how he feels! He has told me so. I don't know how to give him that security. He believes in actions... not in my words.

That list of his was a strategy to try to take those facts of his mind on paper. And I guess, a way to look for plot holes... to catch me lying or confusing facts... He felt betrayed because I did not tell him about my past and because I did not get tested before we got intimate.
He says that he has completly lost trust in humanity. Because the one person that should be closest and hold you dearest betrayed him. I did not risk his health on purpose. But as a matter of fact I did. But out of stupidity. He won't forget this easily.
And I can't blame him for that. I was so naive and careless. In the beginning of our relationship when I had an appointement at my gyn. Some of the things he had said made me doubtfull about men I had been with. I got tested on chlamydia... but I acted so cowardly and egoistic... neither telling him about the test, nor about the negative result. I still don't know how to get my head around this. What was I thinking?? How could I blame him for his doubts and lack of trust? It is nothing but a natural and healthy reaction to sneak behaviour.

The other thing is about personal values. It was his choice to wait. He never wanted to get involved with anyone who has a past like mine. According to his values I was a bad and sick person.
He used to still see positive qualities in me. Else he would have just left me... not seeking therapy.

Well and I guess some of the things just scared him in a way... because he started doubting weither he could be enough. Weither I was looking for the same.

I am glad that you found love! Thank you for sharing. The way you describe your relationship sounds quiet simular to the one my boyfriend craves and one that I am looking for, too. Comunication is important. It is what we are struggling at.

Is it? To some extent, yeah. If he feels like he will never be able to cope with it, it would be best to admit and call it off.
On the other hand he is suffering and not in a healthy state. As his partner I want to support him no matter what. But, yes, I can't solve this. I can only be there... try to rebuild trust. Give him the feeling that at least I am sure that this is right. But the more I feel that he does not love me at all the harder it gets.

I am deeply sceptical about the therapist, too. Not because she is working against the relationship. But because she is supposed to help him. And not send a person away feeling worse without offering any kind of suggestion. He is taking therapy because he wants to save the relationship.

Yes and no. My past and the beginning of our relationship are quiet blended in his view. I regret so much that I ever got involved in being someones affair. That was one of the worst things I ever did. But that thing ended only a few monthes prior to our relationsip.Though he knew about this, because we were both unhappily in love at the time and talked a lot about it...
Still. That person called me when I was with my boyfriend. And because I avoid to harm people I just said I would call back... not thinking how the man I was dating could feel about it...

I guess some of the things I told him as a friend made him a little suspicious. And I did not want to ly. I did not want to hide my past. I think it was not what I told him. But how. I felt insecure. I was stammering. Giving very short answers. He wanted some kind of reflected commenting. Context like: I did not have intercorse with all of the men.