Girlfriend Broke Up With Me...

Well, 2 days ago my girlfriend broke up with me. After talking 2 her she has revealed to me the reasons. She wants more freedom (so initially to be able to do stuff with other people), she doesn't want a serious relationship, and that she lost feelings a month ago... to make it all worse is the fact that I bought her a promise ring and already gave it to her as an early Christmas present so when she wanted to breakup my heart was ripped to shreds... the one girl who I believed I would spend the rest of my life with, the one girl who told me that she believed I was her perfect other and that she would spend the rest of her life with me... After she told me I could feel nothing but pain and hurt... The one girl I trusted more than everything, I suddenly lost all trust.... but now at school with all my friends, I'm starting to feel a bit better, because I am single, no longer stressed about losing someone, no longer worried about what I could do or did wrong, and the freedom to be with anyone or hit on anyone because it's allowed since I'm not in a relationship. So maybe this breakup isn't as bad as I thought, for a while I'm not going to date but will instead try to enjoy life because I haven't been able to do that lately