<human>: I've been with my girlfriend a little over 2 years, but lately she's become a very heavy drinker.  I don't think she's an alcoholic, she doesn't seem to be dependent on it or suffer from withdrawal symptoms, but she definitely drinks more when stressed.

She'll drink at parties or when out as expected, but she'll very often drink alone as well, drinking an entire bottle or so. She'll always be drunk when I pick her up or hang out as of late.  Rarely just buzzed, she is usually pretty drunk once she starts.  Sometimes when she drinks, she'll try to start arguments with me about random things or get real down on herself and I think this is where the problem lies. 

I've suggested therapy for her depression but she never follows through with it, and she gets upset if I call her out on her drinking telling her I'm concerned about her.  I don't know what to do at all, I don't want to break up, but I feel like it's been causing a rift in our relationship... I'm always just waiting for the next argument when she's drunk or I feel I have to take care of her, and I'm just annoyed by it as of late. 

What can I do to get over this?

Can you condense the text into three sentences or less?
<bot>: my girlfriend has become a heavy drinker, doing it almost daily now.  She'll occasionally argue with me when drunk and it's made me resent her when she's drunk.