>>1 losing the people you care about never gets any easier, and it's perfectly normal to feel the way that you do. You can't beat yourself up about what had happened to R, that was his choice and although people could have helped him, he just went down that road. It may sound harsh but you can't blame yourself, that just makes it harder for you and everyone else as well. You need to focus on grieving and remembering all the things that you liked about R, all the things that he would want you to remember him by.
Like what
>>2 said, you need to help V grieve as well, it must be even harder on him and he probably needs your help, so stay strong together.