What advice should I give?

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I know it's unhealthy to advice especially when I have no idea whatsoever how one feels. But there might be something in me that people actually like to ask for advice from me, even if I haven't experienced anything like it. Most of what I have posted here are based on my friends' problems and not entirely mine. The dilemma I face is what should I say to them. The scenario: I have a friend who just recently broke up with his girlfriend. The boy is like a little brother to me, and I've seen how affected he is. 3 days have just passed since they broke up. My friend went to the girl's house just to tell her parents that they were no longer together, and just to visit them for the last time. After 2 days, he decided to go to the house again to talk with the girl. The girl was entertaining another guy at her house. She merely told my friend that she and the new guy were already boyfriend-girlfriend. My friend was crushed. But he told me he has never regretted anything. Based on what he said, he has given her everything, but apparently his everything isn't good enough. Having experienced none of this, I can't think of anything good to say. Any suggestions out there?