I will try to answer in one post.
At first - thank you all.
For those who shared their bad experiences- Im sorry that you went through this, abuse is horrible

I would say that he felt guilty very often after saying something sexual to me and said sorry but I said its okay. He used to say he thinks its wrong, it seems he also doesnt know if he wants it in real life. Now he feels depressive and says its not because of me but he is not online anymore and says almost nothing to me, last time he said that he is so exhausted but he works very much.
I think that he realised its wrong and now avoids from me.
I miss our conversations, he made me smile texting me anything. I feel like I miss him and Im worried about him because he seems really depressed.
I dont think he is bad person, first time he wrote something sexual to me he said sorry. Next time he said he must be silent about his thoughts. I always said its okay so we continue this.
Now he says he feels bad and dont know why. I hope it will be okay.