Why does chasing after a girl push her away?

smg8689
I broke up with my girlfriend over this past summer. The reason for it was something completely stupid. It was based more on an insecurity than what she actually did. So the day after I tried to apologize and explain, but she didn't want anything to do with me. She was pretty pissed that I would end it over something so small and was just really hurt. We dated for about 6 months and for the last one the insecurity caused me to not be the best boyfriend. She brought up a few things. Since then I had been trying to fix things and get back together with her, but all I've done is come off looking needy and emotionally messed up. I've tried leaving her be for awhile and waiting for her to come back on her own, and she did a few times, but every time I show the slightest sign of not being over her she up and leaves again. She said at the beginning she wanted to work things out eventually, but she changed her mind. She'll never say it, but I know it was because I couldn't let her go. It really sucks because the reason I can't let go has more to do with not forgiving myself for ruining a good relationship with the first girl I've ever had these feelings for over something so stupid than it does anything to do with me being needy or unconfident. So what I want to know from girls is why is a guy not caring and not trying to fix things OK, while the opposite makes you run away and move on? I will never understand.
Why does chasing after a girl push her away?
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