My ex's best friend kissed me...

It was at the end of the night after a rockin' party. I had a feeling that he wanted to, but I had never really been sure if he liked me. Then he kissed me. And now I'm worried that he will get an attack of conscious, and tell his friend (my ex - were good friends, hangout all the time), and I don't want him to ruin anything. We haven't said anything to each other about the kiss, so should I tell him to keep his mouth shut or just wait it out? I don't even think I would date him (despite past posts) so I really don't want this to get out. Any advice?

Why did he do that!?!?!?! grrrrrrr!
My ex's best friend kissed me...
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