Me [20M] with my GF [19F], snapchat gone wrong?

I'm not sure if OP didin't phrase this correctly or comment section at this time is bunch of white knights ( I litteraly saw almost identical thread where a girl wrote this kind of boyfriend behavior and eveyone said to "leave him" because he didin't respect the boundaries she set ). Well moving on from the whiteknighting assholes giving wrong answers.

To OP, not wanting a girlfriend to do some kind of activity is totally normal. I wouldn't want myself a girlfriend that would get blackout drunk and party nonstop or wouldn't feel boundaries ( Had this one girl that would keep losing her phones, get blackout drunk and so on ) . This is a preference. To find a partner that matches you. You can't force her to stop drinking but if you both mutually agreed to set boundaries for her to be more responsible and not get blackout drunk and she lied and broke the boundaries and no matter what these whiteknights in the thread say - you have every right to be upset.

Just talk to her and tell that you don't want to force her to give up unresponsible partying but if she wants to live this way - this makes you uncomfortable and you either have to figure this out and split up.

And for the people who will downvote me - put it in this way. You find a person that used to smoke weed. You don't like weed, you don't want your SO to smoke weed. He promises you that he stopped and he won't do that again. You both agree on that. And in friends snapchat you find him smoking weed when he told you that he's just going for beers. He lied to you in the beggining that he doesn't want to do anything with weed just to get with you ( Like some people always play good guys in the start of the relationship ). So you break up with him cause you don't want you SO to smoke weed. If even from this example yout think that it's "controlling" you need to go bang your head into the wall a couple of times and stop posting into this subreddit because you have no idea what you're talking about.

The example I gave is identical to OP's but genders switched.

So OP you have to talk with your SO about this lie and tell her if she doesn't stop doing - you don't want nothing to do with her. Also just clarify to her that she has to really want it cause you don't want to force her.

TL;Dr OP has every right to hurt because she broke both of their MUTUAL agreement on not doing that.

/r/relationships Thread