Beofre we were going out my girlfriend liked to party from time to time. However I'm not really into that at all. I'm quite against the whole drinking in the context of a party because everyone's doing it. However whenever she did, and told me about it (drunk messages etc) after we started going out it really affected me. I felt like shit, angry, sad and sick where i felt nauseous, heart races and can't sleep. So I told her I didn't want her drinking, I didn't want to pull the controlling boyfriend card. But I just couldn't handle her drinking. This was like two weeks into the relationship. She was fine with that, 5 months later (last night) she had a party at her house because her friends were all going to start drinking/getting high so she decided to have it at her house where they knew they would be safe because she didn't want them driving while under the infulence etc. She left her away message as "I'm sorry and I love you." I called her to ask what it was about and she explained everything. Apparently she had "a few sips" but shes on BC so she sounded kinda out of it because its obviously going to affect her more. Although she repeatedly told me she was fine. It still made me feel like complete shit. Now she's decided that she wants to drink from time to time and telling me how unreasonable I am. She wants to come to a compromise, but I just can't. Because whenever she will drink, I'll feel like shit again. And so, eventually I'll just have to break up with her because I won't be able to handle that anymore. So she was like "what if I don't want to follow what you're telling me?" and I just responded "then you've chosen drinking over me." Then she's told me that she doesn't think it's that black and white. However, for me it really is. I know its not really fair for her, but I don't know what to do. This is the only time I've ever asked her not to something either, I'm incredibly chill and leniant, not a controlling boyfriend at all in any other respect.