Recovering Old Friendships After A Nasty Bombing

So here's the problem. I have more than one friend now who happened to have a pretty good friendship for a while.. until that asshole, love, came in and screwed it up. The girl falls for the guy, the guy says "no, thanks" and they stop talking. Just like that. Literally, the very next day, they are like complete strangers to another, just another student in the school.

Sadly, they haven't made contact at all for... I'd say for 1-2 years now? One of the girls tried to talk to the guy right after that little incident, and he just ignored her. Now, the guys aren't bad people, obviously something had to click if they were friends before.

So a year or two after countless awkward "stare+quickly look away"s and uneasy-silence-when-they're-in-the-vicinity-of-eachother is getting a bit ridiculous. They were friends once, and they toss it away because of that single little obstacle?

Now I'm trying to get the two girls to be friends with the two guys again. Any advice on how to tackle this or help them on what to say? Greatly appreciate it!

Jam it back in, in the dark.