The most important questions you ask yourself should be asked like it's three in the morning.
As a guy -- I can speak with some authority regarding the bitterness of the guys on this thread. They've married the fourth or fifth best looking girl from the high school class (the first through the third either married the son of the car dealership owner or left town). Life naturally doesn't turn out the way it was supposed to. Five years down the road, if the guy is making 10 cents an hour above minimum wage, some younger chick is gonna flirt with him and he's going to start seeing the possibilities of a life without wife. Meanwhile, the wife is a little ticked off about how her life is turning out. So, they start smashing the marriage to bits...
But having been married for not quite 38 years (and no,we didn't know each other in high school,nor even in college!),I can tell you how a GREAT marriage works.