Hi Sam !
Thanks for your question.
Well, the first question you can ask yourself is why she blocked you on MSN. You seem to think that its because you talked to her too much. But maybe you were too agressive, or too insistant : the message may be that she is not interested. You can clarify that with her.
If she hasn’t the same feelings for you that you have for her, try to forget her. Go out with your friends, do activities that you like : that can help you get over the tough period !
François, for AlterHeros.