Every woman has a price, therefore every man can get got. You got nikkas worth 20x everybody in this thread getting thrown in the bushes for broke nikkas. Don't get too cocky, just legit be that nikka and hope for the best. All you can do is lower the cheating percentage.
That being said, what should make a breh confident that his lady wont cheat is, imo, A) be the greatest man in the vicinity by far. Health A1. Money A1. Dicc game A1. Confidence A1. Personality A1. Leadership A1. Options A1. Women whine all day about how rare this type of man is. Put in work, and be that. B) Communicate (not verbally) EARLY that even a small hint of infidelity = you GHOST. Not falling back, nah... it'll almost be like you never even existed. No "talking it out" No "hearing you explain." No responding to texts. GONE. You're the prize. She hit the jackpot for being with you. A woman should feel like this towards her man every single day they're together. If not, the cock carousel looks more inviting to her every passing day.
The combination of A and B handles the vast majority of problems a breh can have with infidelity. Finally, C) you have to always be mentally prepared to move on without her and be ok with it. If a woman knows that her man embodies A+B+C, then she'll be on act right 95% of the time, unless she's a dumb broad.