How do I get through the breakup? Helpm!

I was in a relationship pretty much for 5-6 years.I knew her since my childhood. Initially we both loved and cared each other .We have had fights and breaks in the past as well for about 2-3 months,and still my persistence worked and she came back into this relationship. She didn't have a job that time but now she has a job and colleagues around her so the distance started increasing and now recently I was going through the important phase of my life i.e a govt exam and I had to be focussed for a month so I couldn't give her much attention and so did she. Now that its been quite long,I tried to have a conversation but she doesn't have time whatsoever and started ignoring me.And she very much clear from her point of view that she doesn't need relationship and doesn't need to marry and it's not her thing,is what she said.I tried everything,told everything about however she wants to live is fine I m ready for all that,but she doesn't want relationship with me,but says can be friends.Helpm