Girls, why is my ex so uptight around me?

Anonymous
Me and my ex have been "friends" (quotation being that we bicker and fight still, which is odd for me because I never fight with my friends). Now these are usually about nothing major, its just usually about how she thinks thing should be. Like I make a joke to her to stay focus and stay away from shinny objects, she got mad and we didn't talk for a week until she asked me to go for a walk. Then a month passes nothing really happens we meet up or chat once or twice a week. One day she signs on to facebook while I am on, and I didn't see her online, until I checked to see who was online and she said "So no hi from you?", I said well I was going to say hi and then we kinda dropped the subject and started talking, but I am really starting to get annoyed by her behavior, maybe I am being to harsh towards her. Also one night we were talking about fights and how hitting below the belt was not fair, and she jokingly said "Well if I hit you below the belt, I don't need those anymore". She was just joking around, but I find it odd she would go as far as talking about our relationship again. What do you guys and girls think?
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any opinion is welcomed, I am just trying to figure things out.
Girls, why is my ex so uptight around me?
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