The most miserable people that I have seen are Unmarried Old Females. Believe it or not but this is what I have witnessed personally.
When you are young you may think you don’t need anyone to take care of you, you are energetic, want adventure in life but at some stage of life when your knees start to hurt, when you need a cane to walk, when young people ignore you considering you old and boring, then maybe you will realize that it hurts to have no family no kids all that enjoyment in your youth comes back to haunt you, in your youth you may want new adventure every night without fears of long term commitments but one day you will hit the menopause and impotency, then maybe you will realize marriage is not just for the sex but fulfillment of certain other emotions, like having and caring about children, love, responsibility, decision making skills etc. Nothing is scarier for a human than loneliness.
Regarding marriages in Pakistan arranged or love, the way most of these happen there is nothing Islamic about them. And again my personal experience is arranged marriages are more lasting then love marriages. Bakio ka to nahi pata par Pakistani Mujnoo, Laila say wo wo wady kar laita hai jo badh may nibhany mushkil ho jaty hain.