Exactly. As long as you are available for them to blame, they will. It isn't untill you put enough space between you and them and thy realize they are still unhappy that they MIGHT realize you aren't the cause of all their troubles.
BTW, this can often take a loooooong time. Realizing you didn't cause thir problems is just the beginning too. There is a veru long road between realizing you have a problem and working to heal a marriage.