Did i walk away or was this just another good guy getting screwed in the end?

i just cant figure it out. every girl ive dated ive treated them the best i could. the last girl i dated i fell for i fell in love with her. she said she loved me, well i did all i could she said i made her feel like no one else has an that I'm made her so happy an that she couldn't believe she met a guy like me that was so good to her.. an all of a sudden things go down hill she text me sayin that we should just break up cause it what everybody wants (ppl around her friends an etc talked crap an even sent me messages sayin she was cheating) well i didn't want to but she broke up with me then a few days later she call or text an we got back to get her she said she wanted to be the first girl i ever say i love you too an the last. she has had her problems with stuff in her life that has cause her pain but ive been there for her.. but then i call her an another guy answers the phone an refuses to give it to my girl sayin oo so ur that punk as* david i was like let me talk to her they refuse so i hung up i was already mad.(oo an my gf at the time is in ohio she lives there but comes down here to miami also so it was long distance) k then i get a voice mail sayin better lose my girl # blah blah then my girl calls me all sad an didn't want 2 tell me who it was after 10mins she finally did it was her ex an then she hung up i told her i really couldnt take her playin games if she wasnt going to be truthful then fine. she blame me sayin that im walkin away n i dont unerstand what she is going through(i was angry but i never yelled at her or anything).. after all of this i tried everything but i felt she was dishonest an no matter how good i treated her she would never be happy.. my ?? does it seem as if i walked away or that she gave up