I told my mum about it and she lives nearby. I made her promised me she won't tell my brother by now. I want to do things as best as possible.
The only option is him going out of the flat, because even when he contributed with the arrangements, it belongs to me, so I want to be fair with him and talk to him to give him a good way out.

The best of all and I thanks god for this is that we don't have kids even when it was his dream, I rejected that possibility partly because of my psychological issues and partly because I don't consider him the right person to rise a kid. At least, not with me as a couple and the circumstances under. I don't want to make him seem a horrible person but I saw his attitude with my nieces and nephew and I could say they are more mature than him. So, at least, no kid is gonna suffer or suffered.