Once A Cheater Always A Cheater?

We all know someone who is a cheater and/or someone who has been cheated on. It's pretty much expected that people will cheat whether male or female, but can a person who has cheated in the past change? And can you ever really trust someone after they've cheated on you? There are plenty of stories of relationships and marriages that have "survived" infidelity and I'm more likely to believe them than not and I'll tell you why. People change for the better each and every day. People have gone from criminals to law enforcement officers AND are staying on the right side of the track. People have gone from drug addicts and dealers to preachers and perfectly clean Christian people of the church so I totally believe that people can change for the better even people who have cheated. I'm not sure exactly how relationships survive infidelity, but obviously it can be done if both parties work hard at the relationship and making progress towards being better people for each other and the kids if they have them. What are your thoughts on this topic? Do you think people who have cheated in the past can change for the better?