Why do couples fight ?

You are wrong you never understand me.  I always understand you but you do not care about what i feel.Who should be blamed the girls or the boys.Who starts the fights and who is the innocent one.Argument is not bad but it should not become frequent otherwise you become fed up and find no peace in being together.The other person may get upset when you see a couple fighting but it is best to mind your own business the couple will sort it .It's their problem not yours you may take sides and there is a chance the innocent one gets hurt.Why do really couples fight why cannot they stay in harmony.Everyone has a unique personality & no one can be like you.You may have similar qualities or flaws but somethings are going to be  of yourself only.Couples fight when she thinks that a plan is right and he thinks plan b is right.He enjoys solitude and you enjoy crowd.She thinks before she speaks and he says without even thinking .He wants to live a mediocre life and she dreams big.These differences may make you feel that you are not compatible with the opposite but you have to enjoy each other's presence in whatever you do.Keep fighting but do not forget to forgive each other for the mistakes after sometime because after all we are humans not saints.