People get divorced for a lot of reasons. Personally I think no one should get married if they even view divorce as an option, like saying, "Well if it doesn't work out, I can always get divorced." It's just not an option in my opinion. If you get married, you should be prepared, remember your vows, be truly dedicated to the relationship, and be in the relationship for the right reasons.
I would say that you should live with your partner for a few years before deciding on marriage, but that doesn't always work. In some ways I still believe that, but for some people it makes no difference because there's other factors in their personalities. For example, my sister was with her boyfriend for 10 years and they finally got married, had lived together for a while prior to marriage, and then a year later got a divorce. The reason is because all throughout her relationship with him she wasn't that happy, she was settling, she didn't think she could get any better than him, and she was dependent on him for things such as money, transportation because she didn't have a license, and was afraid to leave the relationship for fear of not finding her place, not finding another partner, for making the wrong decision. When she finally divorced, she moved out of state and is now happier than ever with her new life, her new partner, and has a better grasp on what she wants and deserves.
I also think that too many people get married because they subconsciously feel that it's what they're supposed to do. When everyone else around you is getting married, having kids, and settling down, it makes it seem like that's what people are supposed to do, so some people might get married because they feel pressured to do so. You shouldn't do something because it's what's normal, you should do it because you really want to for your own reasons.
Also, don't let other people's failed relationships set an example for your own decisions.
Since I'm a sexual degenerate, and NOT a pervert....I think you can believe me.
Married once, still married, going on 15 years, this August. Believe me, sometimes it really isn't fun, and sometimes it wears on your very last nerve, but I'm very glad, and lucky to have my wife, and to be able to spend my life with her.
Aww. That's so sweet.