<human>: Me and my gf has been going for 3 years, all is good, but she does this thing where she doesn't talk whenever I pissed her off in the slightest ways. Also she is psy major so I m suspecting that she is conditioning me using silent treatment. This gets me so mad which obviously makes me wanting to ask her what's going on, but she just doesn't say anything more than a few words, like "Yes", "I don't think so", "Yeah".
Even when we are not argueing sometimes she would go to total boring mode and not talk and shut me off. For eg. She would say she has plans in the weekend but not tell me what. I mean sure you don't have to tell me but if i asked you can't you at least come up with something better than "I don't have to tell you everything". 
Last time we ran into some guy she knows and I ask her who he is and she said "some creepy guy". And I asked her "How you know him" after which she just shuts me off. I mean wth is "some creepy guy" supposed to mean, if he molested you i wanna beat him up right, she just wouldn't tell me anything about that person. We end up argueing the whole day about it and to this day i still don't know who that guy is. I'm so sick partially cause she wouldn't tell me but also the fact that I could have dropped it and probably we didn't have to argue. But god you know what the best part is? I TRYED to drop it, but she silent treated me right after she said "he's just some creepy guy" and wouldn't talk about anything. which left me nothing else to talk about. Sometimes I wonder if we should still be together.

Can you summarize the given text in a few sentences?
<bot>: gf silent treating me, don't want to argue anymore, sick of it, want to stop, what to do