Cheating dad problem!!!?

[mirabelle]

im a 13 year old girl and i know ive asked this before but i wanna be sure...this is a convo on my dads fb(yes i know i shouldnt have)with a woman(i dont know her):

my dad:hey babes thats a sexy profile pic u got there.makes me wanna hold u xxx

the woman:aww tnx sweetie that was at a wedding in august x

my dad:before i forget:love u xxx

the woman:me too x cant wait to see you on the 12th


i didnt read the rest but on an other convo with another woman:

my dad:i want the best for u...i will always find a place in my heart for u and will always make time for u xxx


btw my dad is a 50 year old married man qnd he's a vicar!!!

im really shocked;i cant tell my mum cos shes bipolar so she wud become really depressed and ill.i cant tell my dad cos he will want to know why i was on his facebook!!

plz help!!!