You let her do most of the talking... she is the ones that has decided she has to leave. Tell them that you love them both very much and that this has absolutely nothing to do with them... Stand behind her and feel free to correct her if she says something that isn't true. Strong, confident, decisive, in control is the key here. It is going to be brutally hard, don't show your hand, no tears. You are strong because you know the key to your happiness isn't going anywhere.
