You were abused by your brother, and still you tried to open a line of communication to him about this. But then you got bullshit, lies and excuses in reply. If that's how it's supposed to stand between you two, what possibility is there of any relationship with him? If this were me, I would just write him out of my life and spare myself the inevitable new pain and trauma of trying to pretend everything is "okay".
I think the most important part of your post comes when you show that you recognize that "family" isn't always limited to blood relatives. If you cut off ties with your brother, you aren't really losing anything anyway - what kind of brother is he if he won't even take responsibility for his past behavior on such a huge issue as abusing you? And there are plenty of good people out there who can be just as close and important to you as a blood relative would be. I have written off several of my relatives as a toxic waste of time, but at the same time I have brought into my family circle some people who are very important to me: I now have two mothers, for example, two new brothers and a sister, not to mention all the guys I feel very close to here.
"Family" is a feeling more than a fact of blood, Jackson. I'm glad you are able to see things this way. It's no loss to us, and no blame on us either, if we recognize that toxic blood relatives can poison our lives if we continue to drink from the cup they have on offer.