Why are some people so cynical about marriage?

Try not to let things get you down, there is always a chance of meeting someone special out there. Maybe take your natural pessimism and try to use it constructively. Use it to make sure you marry the right person and that you don't rush into things like some people do (often the ones who end up unhappy or divorced). If you take things slow and really get to know someone, you can both end up making each other very happy.