After looking at your other posts and seeing other comments I am confused as well. On one hand teenagers could be obnoxious simply because that's how they are ( I take it that you do not have kids) and on the other hand you previously said that she is wonderful yet now she is off putting. The whole situation with your gf and her daughter sounds troublesome. I don't generally advice to leave your partner when they are ill but this might be the case when moving on from this relationship might be a solution. Do you also financially support them all?