It is not easy to hear that your husband would not have strayed if your marriage was better.
However, how quickly you get into a relationship isn't a measure of how desirable you are. It's not necessarily the most attractive or likable people who get into relationships the most easily.
Your ex just happened to stumble upon someone else before you did. When my ex first got a new girlfriend, I feared that it endangered the friendship we formed post-breakup.
But even if it changed the dynamics of our relationship a bit, it didn't change how he felt.
Getting into relationships in the past at least hasn't changed the way cared about my exes.
The PRIMARY reason for problems is that you do not have that in your marriage. But in the vast majority of cases this kind of thing is .