What are some good sad slow songs when u have 2 friends that left for 2 months to another country?

Well my 2 guy friends just left to this college program where they go to dc for 4 days, europe for 1 week and syria for the rest of the time until the 2 months are over...we just graduated and weve been 2gther from 2nd grade until now and theres more of them too but they are stayin though but because im closer to them 2 i miss them so much and i want like cute and sad songs do you guys no any please give me some good ones. thanx y'all