Problems with friends!

I found this website that tells me how to co-exsist with my friends. Every one once in awhile has these sort of problems, like not getting along with other people, groups of friends(cliques), and even not getting along with your friends. For example one day your all fine and good with your best friend one day and the next thing you know your fighting for some reason. Now this website i checked out gave me information about why these things happen and how you can resolve around it! Well friends can be the best thing in your life, and you don't know what you would do if you never met them. But sometimes you just can't stand them... right! Well that is the problem these days, everyone is nice and then end up fighting. If you always fight and then are friends again then you shouldn't be friends because it destroys your other friendships too! But others might say different. I think people should get it together, if your friends then you should act like it. Now this can also effect the other "cliques". If your popular then everyone would want to follow you maybe and it would cause a HUGE problem. So what i'm saying is friends should be friends and we shouldn't have problems with co-exsistence in our friendships!