Relationship nonsense?

It sounds like you're in your teens I'd guess, so at this stage I wouldn't worry too much about relationships, you say that you will get close to a guy but then after a few months go off him? It's just what can happen at your age with all the hormones and what not. Just have fun and experiment, if you feel as though you like someone and would like to give it a try, then go for it! Enjoy being young =]