umm...if your mom treats you as badly as you say, i wouldn't go back. you should stay wherever you think you'd be happiest.

as for your girlfriend, i don't know what to tell you. maybe you should just come out and ask her (nicely!) why she's acting like that. you may have been acting differently towards her as a result of the stress from your mom, and you may not have realized it. if you are still in love with her, why not do something nice for her to surprise her? to show her how you feel and that she matters. girls love gifts, even if they're small. its the thought that counts

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