There is a saying that says
"If you can't change the man, change the man"
This can also apply to women.
This is regarding as in relationships there are of course good and bad things, but sometimes you can't change the person (man or woman) to the better if that person does not mean to change or improve and he or she will be the same always due to his/her personality, his character, his/her attitude.
I mean there are peoiple who simply can't change period no matter how hard they try they can't, because that is the way they are or the way they were raised or the way he/she was born period, and this is harder when the person is already an adult, because once you are an adult people dont change, unless that person really WANTS and TRY to change, if not, is a lost cause and you have to put up with it if you want to keep the relationship alive, unless like the saying states: "change the person and move on" even if it takes many relationships in your life to finally settle.
Not many people will agree that a person has to hop from one relationship to another (those men or women who had been in more than 3 relationships, cause people tend to think they are immature, they dont know what they want ) and play until finding the right one who that person does not need to change because they feel comfortable and good with that person.
One just simple example but of course there are many others out there. Jennifer Lopez finally she settled with BA, and of course she had been married many times before and had many failed relationships too. Since noone knows her in person and in reality, what if with Ben Affleck she really found the love she was looking for that with her previous men, she could never found? I mean she dated him 20 years ago, and last year they found each other again. This is just a mere example there are plenty different ones out there.