Why do love fail at some point

I have been priviledge to listen and hear lot of people talk about how they handle love and all other things especially those who are just new in a relationship, the way they cherish each other and they can't do without theirself for a single day and they always stay in touch everytime, going out in the morning, they will call and talk on phone afternoon and also night so this always baffle me why this kind of feeling do not last long later on due to one reason or the other.

Likewise we see old couple who are still very much in love with each other and the way they communicate, young people who are in a relationship will surely want to be like them but it is not that easy. Back to the point where i said those people who are new in a relationship, we see how they do and also always taking each other to dinner, go for parties together very often and also going for special occasion.

But as they grow some feel all those things are not actually necessary in a marriage because they have given birth and they never cherish those things again which will definitely cause a lot of issue between couples, some focus the love which they had before for their partner to the children and make it seems as if the woman cannot be loved again.

The belief which will still be in the man is that there is still love present in that relationship or marriage but that is not the case, no matter how old the relationship is getting to, one should always remember those days when the relationship started and do some of the things lovers do when they just met, going for a parties and also getting things as suprise.

This actually will not make love fail at some point in any marriage even though there might be ups and down but that wont make any room for love failing.