Lost faith in all girls...?

After this break up I thought I found the girl I always wanted. I seem to always be with horrible mean girls and this time I found a girl so sweet and genuine.. She put on a good show... Left me for what I think is another guy, (although denying that) I was thinking about telling her I loved her until one night she texted me a break up and after a couple texts said we shouldnt even stay friends.. What's that about..? I don't think there is such thing as a nice girl.. I've lost faith.. Don't know what to do.. Dating another mean girl will throw me over the edge to insanity.. Just need general help. What am I missing..