MILF gone for sometimes off 2

Turned out The whole trip and taking some times off it was all about cheating….so confused a woman i believed all of my life that she a loyal woman
And now ..cant deal with the whole situation ..first i thought with a guy sending her photo in her facebook and pretending that he fucked her is fake..and he is just some random guy in facebook annoying people as my mom didn’t respond to him…
but now i saw she sent a massage to the same guy that send me the video that i let you record ..and he sent her the video…and said The best two nights i ever had see you soon love..
now should i tell my dad ? give me some legit advise guys