Is dad still having an affair?

Yesterday when my dad let me use his laptop, I saw a msn icon. I nevaknew my dad used msn so I clicked on it and it said his name at the top, and his personal message was, “I love you so much Sayang (L)” But there was only one contact, a person with “Solitaire” as their display message, I knew that wasn’t my mum. She doesn’t have msn… so I told my sis who told my mum who asked my dad about it…then in the evening he came downstairs and asked me what I saw and told me he only had yahoo.. Then my sis told me that last year he kind of had an affair with an ex-student, mum found out in Malaysia when my dad got a txt message saying “I love you soo much Sayang! How are you?” that was why my mum came home realy drunk one night and puked and fainted. She was so upset that dad had an affair that she got herself drunk. Ever since then we neva heard from the ex-student again… So the question now is… what should I do about this because I am so sure that I saw the msn icon and I KNOW what I saw…who does my mum trust…her husband who kind of had an affair…or her dumb asss youngest daughter - me. What should I do, I look at my dad differently now, because I never thought he would do this…he loved mum a lot! Please help me this is really urgent!! I need to find some good advice because im treating my dad differently and he doesn’t know that I know about this…

xoxox ~pree~