A friend of a friend, in his 40s, got married recently. Like most, I thought that if he'd made it that far he might as well just continue on and remain a cocksman. Someone brought this up to him and asked why get married now? He replied, "Man, I need the accountability." That's not why I got married, but I get it. Without my wife, I would be a total mess. I know this because if she ever leaves for a weekend or more, I turn into a 22 year old and all the old habits come back. Not to say I don't enjoy those times occasionally, but it's no way to live. Self destructive behavior, just like all of us eventually, gets old.
You can look at marriage as a fairy tale, Princess Bride thing, i.e. two souls becoming one through true love, etc. Or you can look at it as two people, who love each other, committing to live their lives together, with all that it brings, for their mutual benefit in all aspects.
If I had married my wife within the first year of meeting her, it would have been under the first viewpoint. But we got married about ten years after that first make out session (there was a good 6 year hiatus in there for college and after, thank God), and at that point the consideration of marriage took the form of the second viewpoint.
In other words, the decision to marry someone involves more than just loving that person. That should be a given. My two cents.