Support needed 😞

So today my husband told me that he is not fertile. I knew that there was something wrong with him this week because of the way he has been acting. I just never guessed that it was going to be this. We have been trying for a little one for so long that he has been pushing me away when he said that he wants me to be with someone else to have a child. I kept on telling him hell no that I would never leave because of that. He told me that he was scared and nervous to tell me at first because he thought that I was going to leave him. I just wish he would of told me something sooner. I told him that I still love him that things will be okay even though that it takes time. He starts his first treatment tomorrow. He told me that the side effects are him being very aggressive. He was so upset that he said that when he does this he doesn’t want me to be around so that I don’t get hurt from him. I support him 100% I’m just upset that I’m going to be away from him because of the side effects. Has anyone else been through this before ? If so please tell me what was your experience.