Incorrigible mistakes:Why it cannot be rectified?

I had a dream yesterday night quite unusual from before as I always run in my dream, dream of my own death, snakes etc. But this dream was totally different . I saw my ex-girlfriend. I was talking to her on phone and saying not to drink too much. I even asked whether she eat properly these days or not. I scolded her in many ways and she also did not react. The phone got disconnected as I was travelling and again I tried but she did not pick-up the phone. I was so restless that I wanted her to come back in my life again. It was me who parted ways and now I wanted to re-unite. It really seemed strange to me as well but I sms-ed her my wish which was very true but it did not get deliver. I slept and got up in the morning. I Called her again and she picked up the phone and I told her what I wanted to say her last night .I sms-ed her again and waited for her reply.
I got her reply saying that she still loves me but she cannot come back as we both have been hurt too much and also she doesnot believe in relationships anymore. I again called her and tried to persuade her as much as I could but she remained adamant. she even started crying and I really felt bad for her. I even thought that it’s because of me she becomes miserable all the time. I also became sad and started crying. I also thought that it’s our destiny and I have to accept that things have changed drastically for the past one year so much so that it cannot be turned back again .I again called her but she cut the phone and when I tried again her mobile was switched off.
Suddenly I woke up from my slumber and realized that it was a mere dream but I have read somewhere that we see those dreams which we think of too much. I think when one undergoes through a breakup its very hard to live alone as all of a sudden there is a kind of vaccum created. People tend to fall again in a month or two. Very few people can resist this because it’s very difficult task because breakup is something like you are put somewhere where there is no oxygen and you are gasping for breathe and in this process you try to come out from it as soon as possible. People also fall victim in every sense in order to fulfill that vaccum and women are the most vulnerable at this time. I suppose I fear for my ex-girlfriend of all this consequences so I dreamt about her. But things have really changed in reality. Now its her own life,her own wishes and I am no more to say or suggest anything. She is free to make new relationships with whomsoever she wants. I should not at all pay heed on this matter rather in any matter pertaining to her because If I think in this way I m going to make my life miserable. I even questioned to God as why some mistakes are incorrigible. Why it cannot be sorted out but some mistakes cannot be mended that’s why probably it has been termed as incorrigible. I will definitely come out of this writhing pain but I wil lnot opt for escape route.I will experience this pain as long as I can withstand it and one day it has to fade away. It’s just the matter of time. Its good that I am going far from her. With this she can also rest in peace, she can also do whatever she wants and in this way she could lead peaceful life. Ultimately I also want this to happen. Now no more thinking of her because it disturbs me like anything and I really can’t think much of her. I swear I wont even keep any contact now…No contact at all. Not even think of her. No more sweet headaches as it has turned sour. No more dreams now.