He met this girl at the beginning of the school year and they connected, he started falling in love and eventually they fucked. He lost his virginity to her and she became his "special" one.

The girl dumped him a week later, just so she could be with 2 other fucking guys.

We were at a party, all three of us, we were just sitting and talking and the girl mentioned how her present boyfriend is coming. After that the guy started getting quiet and really depressed. Once the boyfriend came he left the party.

After he left, all the people at the party(it was a small one, just a group of us in high school), started gossiping and talking shit about the guy. I listened to it and I didn't really intervene.

Now, the friend doesn't really know that I'm aware of the whole situation(because of the shitty friends gossiping) and he invinted me over a coffe to "talk".

He's actually popular and good with girls, but for some reason he developed a hard oneitis for a bitch.

How should I go about this?