I think my dad's cheating.. help?

I went through my dad's phone and somehow accidently opened his texts.. i was about to go back when i saw that he's been fooling around (not physically well i hope not) with someone else and i was shocked/speechless/furious/scared everything really. The first thing i thought was i needed to tell mom but we were really having a good time atm dad's always attentive and all and it breaks me to know that i have this piece of info with me.. im scared that if i told her surely everything will go down and they'll fight and im just scared that what if my family won't be whole anymore but in the same time it's not fair for my mom.. i've been acting like I don't know anything and carry on but i'll cry every night wishing that i really know nothing.. what should i do?
I think my dad's cheating.. help?
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