I think marriage can be a great thing, spending your life with someone you love, but obviously it doesn't always work that way. Personally I'm glad that there's now the option for divorce if it all goes wrong, because being in an unhappy marriage 'til you die must be awful. Marriage is something of little importance to some people, but quite a few people (like me) view it very highly. I would love to get married and spend my whole life with him, and cope with all the ups and downs together.
Obviously love needs a physical attraction to spark it off, and I think after that it grows into something deeper, so that even when you're old you are still attracted to each other because you're so intimately connected. Love is inexplicable, it's not something that can be reasoned with, and it isn't always logical which is why sometimes it lasts forever, but very often it doesn't.