A reason for a marriage to fail?

The reason? Women think men will change and they don't and Men think women won't change and they do.I heard this on a t.v. show and I thought Wow! That maybe it. But these days I think it isn't gender specific. There are as many women who don't change and men who Do change. But changing is the key . I guess if one partner changes and the other does not , the marriage does end. your thoughts.