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

I think it won't be fair to generalize and say in absolute terms that cheaters will always be cheaters. I think the root of infidelity runs much deeper and it's different for each person. But based on what I've seen from relatives/friends who've been cheated on, this statement seems to be true. It's sad but unless a cheater confronts those deep personal issues and stops blaming their partners, they can never break free from the vicious cycle.