Wat shld I Do???

Went to KT hse yesterday... We went online yesterday cos i wanna to send flowers n gifts to my mum for mother's day. so i did an online booking... I happen to saw something at the msn which make me feel uncomfortable. His ex gf was online n her nick was so sad... at tat moment i felt so lost... i tried to act normal but i juz can't..... KT asked me wat happen but i refused to tell him cos i dun wan to let him felt tat i am petty or wat.... Can anyone advise me on how shld i react if such things happen again... I really wish i can noe... Its has been 5 mths liao n i still can sense how much she loved KT.... I dunno if KT noe tat she still loved him... maybe i am thinking too much liao.... Hopefully time will heal everything....