Y10NRDY's responses are protected.
Honestly, there are a lot of good ways to help people through that.
Listen to EVERYTHING they say about it. If they see you really care about what they're talking about they'll feel a lot better. I'm not saying don't voice your own opinion, but it's about them, so remember that. Don't go into a long-ass lecture about it.
Socialize and interact with them a lot. That also shows you care, and eventually they'll get over it by talking it through.
DO NOT compare it to a similar break-up they had previously, or even one you had. Pain seems unique to a person when they go through it. Let them feel that way.
Even with all this, you should make boundaries for yourself and what lines to cross or stay behind, based on the situation. If it becomes awkward of uncomfortable enough, they'll feel worse, and you could lose them as a friend.
Criticizing their ex is actually a good idea, but going overboard with trash-talking isn't, main reason being they could get back together someday, or they might still have high feelings about their ex.
But most importantly, act as a force of sanity.
(Jesus, I remember when I had /short/ responses on here.)
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