Some women stay with the Cheater. He may promise and swear, but he gets maybe a 75% credibility quotient.
Some Cheaters become absolutely faithful after the first adultery. Some don’t.
There are some men who may love you, but can’t keep their pants on. It depends on your life how you deal with it.
If you are very busy and have one massive life beyond the marriage, then as long as he is discreet, no problem.
If you are having an affair he doesn’t know about, then he keeps himself busy.
Some women leave when they have someone or somewhere they want to go. It may be a year, five years, but they can never forgive.
Whatever your situation; do not let his adultery become your life.