What should I do about this girl I like?

you can't have that much confidence if you keep going back. that's letting her know you're weak and desperate when it comes to relationships. maybe you're afraid to start over and/or be alone.that means no .sad huh? girls for some reason (some) take advantage of the nice guy.the too nice guy. you have to have limits.if not, you'll just be used and ran over and over again and blame others for it. your a nice guy, let her go,you deserve the right girl.if shes doing this to you,shes not the girl for you. go out meet new people. there are plenty more females out there for you. in her head she knows she can do what she wants with you and get away with it. good luck!