I found that my husband still has the feelings of his predecessor.

Thinking about your ex shows that your feelings are not deep enough and you haven't really reached a tacit understanding with each other. Therefore, the feelings in front have not really been completely cleaned up. If you don't want to give up and let your past feelings have no influence, the best way is to get along with you. People will make comparisons. When your relationship is really harmonious, he can't live without you.