Rather banal and prosaic statement expressed in a German which is, indeed, not egregiously grammatically flawed but could nevertheless - in my non-native opinion - be slightly improved upon:
"I love a girl who does not love me in return, or in part even tends rather to hate me."
I personally would have been inclined to use "das" instead of "was". Whichever one goes for, though, there should definitely be a comma between it and "Mädchen".
Now I've cleared up the linguistic side of things for you, maybe someone can explain to me who the girl is. She's got a sort of "Swinging London" look about her and the weeping guy is MUCH older, so I'm thinking it must be RavRav who's gone overboard with the 60s/Twiggy look now she actually lives in Carnaby Street with that dyke.