Search Results: how to catch a cheater

Do you agree with the saying. " Once a cheater, always a cheater? Do you think people who get caught cheating on a SO are never to be trusted again or do you think they can stay faithful.

You see this fairly often here, the girl has gone through her partners phone because she was suspicious.
Everyone generally jumps on her for invading his privacy, which of course is true but what if she finds out he was actually cheating? Is her behaviour then justified as he most likely wouldn't have been caught otherwise?
Who is wrong in this scenario, if you had to pick one?

*swap the gender scenario if relevant

my boyfriend cheated on me twice. the first time he said it was bcos i was busy with school (which is bullshit bc i still talked to him super frequently) and he had to keep himself busy so he found another girl. we fought and i said i want to break up. he was super apologetic and kept begging me to stay, telling me that he will change so i forgave him. after 6 months of peacefulness he cheated again. this time i wasn't busy with anything and spent time with him A LOT. but he got too close to another girl. he told me it's because she's a super close friend who went away for months so while catching up the old days, he got carried away. he told me that this time he will REALLY change. but i don't know. i can't bring myself to break up even tho im really hurt bc im a coward and i can't bear losing him. and he's a REALLY great boyfriend honestly. will he really change? can he really change? im so scared because i dont know if i can take another blow. can someone please talk to me and give me advice. i need it a lot.