Just be honest with him, and if he's still annoyed - well, he will get over it. I'd listen to him and stay away. You can look forward to seeing how they change and grow now they are together. Tell him that you really like this guy and you are going to see him. Just to clear some things up:
My best friend's just started dating my brother. A recipe for disaster, no?
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Please help! You're lucky to have someone that cares - please don't screw up your relationship with your brother and possibly your own life by going out with this guy. All rights reserved. I recently started talking to my brother's best friend, and we really hit it off.