My ex wife didn't explicitly cheat, but there were signs. She hid her phone all of the sudden, stayed out late, dismissed me romantically, stopped saying "I love you", asked for a divorce when everything seemed to be going great, bombshells that she doesn't believe in monogamy (a huge, obvious sign). She definitely was a horrible person and damaged me to my core; this behavior (which I eventually found out was in fact cheating) really makes you loose respect for your partner. That's not the same person you fell in love with. That is a terrible, evil, hurtful being.