Sleepless nights - Started a new relationship, but apparently I was not over my previous break-up
Hmmm... how do I keep this post a bit short.
I'm really down because of my break-up of this week. I was with a realy realy nice girl, but at the beginning of the relationship apparantly my previous break-up messed things up. I was doubting about if the new relationship was "good enough" because I compared it too much with the previous one. Therefore I didn't jump into it completely and was holding back too much.
Of course, this caused the girl to feel uncertain, because I didn't show enough that I liked her. A few weeks ago she told me that this was a problem for her and it hurts her and that she wants to break up. After that she went on vacation and the situation was not clear. A few days ago she told me she wanted to break-up completely.
Now is the moment that I realize how much I liked and loved her, but didn't tell her because of this stupid previous relationship. During the period I was with the "new" girl my doubts dissapeared slowly day by day, but it obviously it happened too late.... So, now I'm really blame myself for being so stupid. I had a realy nice, lovely and beautiful girl with me, but I didn't realize it enough. I told her about my feelings and this story, but she says it's too late.... And now... sleepless nights... 
@Vnuitu As a human being, we have the tendency to compare our present and past relationships. Sometimes it ruins our present which happened in your case. But it is understandable how you were feeling, you didn't want to jump into a new relationship till you were sure about it as you were already hurt by the past experience. But that doesn't mean you were being stupid, you were just trying to protect yourself which we all do after we have a bad experience, we become more careful. One of the reasons for having sleepless night can be you are stressing about this too much and are still blaming yourself for the current breakup. Try to forgive yourself, accept what has happened and move on. I understand it is not easy to let go. Learn from your mistakes and aim for a better future.