Anas Bin Maalik (radiyallaahu-anhu) said that the Messenger (sallal-laahu-alayhi-wasallam) said: ‘’There are not two people who love each other for the sake of Allaah, and then they split from each other, except that it is due to a sin of one of them.’’

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[Reported by Imaam al-Bukhaari (rahimahullaah) in Al-Adabul Mufrad (401) and authenticated by Imaam Albaani (rahimahullaah) in As-Saheehah (637))