Ok so long story short ish. My dad left my mum after an affair 20 yrs ago it totally tore our family apart and as a child I remember mums sadness dispite her efforts to hide it. So my and sis grew up and moved out and mum met and has lived with since a nice man 8 yrs her junior. It has become apparent that said nice man has been messaging a woman on fb who is half his age. These messages although I don't know exact content are flirty and sexual. Mum told me this after I harassed her to tell me what was wrong. Mum is going to confront" nice"man tonight I am livid. I have told her to do whatever she would advise me to do knowing what that would be. How can I support her through 