I lost my sister to suicide in January of 2004 so I know what you're going through. I don't know how much advice I can give you but the one thing I've learned is that I will always grieve for her no matter how many years it's been. I love her with all my heart and soul and miss her so very much.
You loved your brother very much as well (and still do) so it's okay to just let yourself have a good cry once in a while. The pain and crying comes because you do love him so much. I cry because I love my sister so much. How can feeling love be a bad thing? Allow yourself those moments...it's okay. I find that by allowing myself to cry when I need to without feeling guilty and no matter what anyone thinks that I can deal with her leaving a lot better. I know that these feeling will crop up every once in a while for the rest of my life and I've learned to accept that as it comes from the love I feel for her. I'll never be okay with it but I know she felt she had no choice. I'm sure your brother knows how much you love him and like Sara said, it's not that he didn't care.
I don't know if this helps at all...I feel like I'm rambling. I just think that by allowing yourself those times and giving yourself permission to feel that love that it helps to heal you and keep you moving forward. I know it's hard.
Anyway, I hope you are doing better...some days are better than others but as long as we are moving forward we are okay. Sending a big hug your way.
PS - Sara, I wanted to thank you so much for your post. I like to hear from people who have been in that frame of mind as it helps me to hopefully begin understand what my sister was going through and how she felt. Your insight is so valuable to me and means a lot, corny as that sounds.