if i were you... i would not break up with her... you'll be living with her not to her mother... so in the end it'll be just the two of you...
but... if she is giving you up, i don't see any reason why you should continue your relationship, a relationship will not work if only one side is giving, always remember that in a relationship there is always, UNDERSTANDING, LOVING, SHARING AND ALWAYS GIVE AND TAKE, IT IS NOT ONE SIDED... that's all i want to say... btw i'm married that's why i know what to say...