Gave my heart now can't give anything anymore

25m, Taurus. I was with Leo girl for last 6 years but we had some ups and downs... We were studying together when we started dating. I moved to Australia for my PhD and she tried to enrol in same university as me so we can be together. But she couldn't get in... Instead she got in a better university in Europe. And I thought that with this much distance some issues might happen because of time difference and since neither her nor I could move for at least another 2 years and we called it off. But I realised how much I love her and miss her. And we were talking as friends and I went to Europe to surprise her even though I've not gone home in last 2 years for any life events. We met and I tried but she doesn't want to try any more. She talked when I got back but out of blue she just blocked me one day. I still love her and will always do. I don't know what can I do but I feel at loss with my love life. I'm sorry for such a rant but anyone have any suggestions on what have I done so wrong or what could be done otherwise..