The best way to even tell anything like this; is to tell him in person.. Reguardless of what the outcome is goin to be; be there for him; dont leave him without telling him U still be there for him. Also tell him how U feel about him.. Let him know that some day U may be back with him again.. Be honest; but most of all; tell them why U must break up with him.. But make sure that they know that Ure there for him. No matter what...