HELP i messed up badly what do i do now? need your expirience!!!?

Dump the first girl. She has too much baggage. She's in an abusive relationship and despite your help, is staying in it and just using you to let off steam. Her horrible b/f probably is cheating on her but that's not your problem. You have a new girlfriend. Stick with her. You can feel very sorry for the first girl but the remedy for her salvation is in her own hands. You cannot do anything about it and being around her isn't making you happy despite the fact that you like her. After she's finished with this guy, she will probably go on and pick another guy just as abusive. She's not the girl for you so therefore drop her like a hot potato and leave her to get on with her own life while you go off and get a much happier life of your own with a normal girl with no hang ups. The first girl is bad news as far as you're concerned because she's just using you. She's already told you she's never going to be with you so why should you hang around. Believe what she says and move on. She's the saddo. Don't get involved.