Once a cheat always a cheat? What's everyone's opinion

For me, I feel that I can never forgive a person who cheats. But this is because of my neurotic personality. I could foresee myself not being able to trust the person again. Even if the person is capable of change, there will be a constant lingering air of doubt that would be detrimental to the relationship. Hence, it is more an issue of trust to me. Once broken, it will be very difficult to earn it back. The precedence has been set and it is unlikely I will be able to let it go so easily. Still, this is my opinion based on my personality. I do hope that people can change and that once a cheat doesn’t necessarily means he/she will always be a cheat.