wat is the main reason for extra maritarial affair

the major reason as per me to make jealous to ther husband/wife or to show thm they can be happy without thm...

People do not take their vows seriously. People are not mature enough to be married.People do not keep their single friends and x's out of their marriages.people have moral issues.Some people need to be single and to stay single because the do not have the above articles and also because they do not have self control.