Did I do something wrong

So this past Monday my boyfriend proposed to me, of course I said yes!!! We have been so happy and merging our two families together has been a very easy transition.

Now, two months ago he asked me if there was anything I was not telling him, like a secret. I said no. Fast forward to last night, he asked me again and I told him I did have something to tell him and that it was something I had never told anyone. Not even my ex husband, mom, dad, anyone! I confided and told him that I had been raped my sophomore year in high school, 21 years ago. He of course is so sorry that it happened to me and feels terrible but he is also upset and disappointed with me because I never told him. He feels like I lied and is no afraid there might be other things I’m not telling him. That is not true, I have been so completely honest and open with him. Was I wrong for not telling him two months ago when he asked? I feel horrible about this, we have never fought and we are fighting now, but I know he is upset. He said it will be fine, but I can tell when he is upset.