I have been together with my girlfriend for 11 months, and things have been absolutely incredible.  We see each other all the time and are both so happy together.  We are always incredibly affectionate, we really love each other and we tell the other that all the time.  We talk about the future, about spending it together, and about being so happy.  We have both helped each other a ton, I used to party really hard and do drugs, and she helped me get away from that, and she used to be very sheltered and reserved, and I helped to bring her out of her shell.  Basically we have a great relationship.

Until last night.  We text literally all the time, every second we are awake and aren't in class/meetings, and we always put effort into what we are saying.  But after leaving my room last night, we were texting and she started just sending one or two word responses that didn't really say anything.  I would say stuff like "I love you" and she would reply "cool" or "aww", and no matter how much I tried to find a topic that got her to talk or to make her happier and get her to actually talk to me, she wouldn't.  This continued through the night and into today.  She still wouldn't send anything of substance, and after our class together she came to do some quick homework and hang out with me.  The entire time she refused to kiss me and refused to say I love you, and when I asked her about it she either dodged the question or just said "no" over and over again.  I pressed the question because I could tell she wasn't acting normally, and eventually she got fed up and stormed out, saying "I love you" in an insincere way and walked back to her sorority house.

I don't know what to do.  This girl is perfect, I seriously am in love with her and I do not want to lose her.  I can't imagine what would cause her to act like this, but I feel like I deserve some kind of explanation.  What should I do?
user
Girlfriend and I are always very affectionate and close, last night she started acting distant and refuses to be affectionate, and she refuses to answer when I ask her about it.
assistant
I have been together with my girlfriend for 11 months, and things have been absolutely incredible.  We see each other all the time and are both so happy together.  We are always incredibly affectionate, we really love each other and we tell the other that all the time.  We talk about the future, about spending it together, and about being so happy.  We have both helped each other a ton, I used to party really hard and do drugs, and she helped me get away from that, and she used to be very sheltered and reserved, and I helped to bring her out of her shell.  Basically we have a great relationship.

Until last night.  We text literally all the time, every second we are awake and aren't in class/meetings, and we always put effort into what we are saying.  But after leaving my room last night, we were texting and she started just sending one or two word responses that didn't really say anything.  I would say stuff like "I love you" and she would reply "cool" or "aww", and no matter how much I tried to find a topic that got her to talk or to make her happier and get her to actually talk to me, she wouldn't.  This continued through the night and into today.  She still wouldn't send anything of substance, and after our class together she came to do some quick homework and hang out with me.  The entire time she refused to kiss me and refused to say I love you, and when I asked her about it she either dodged the question or just said "no" over and over again.  I pressed the question because I could tell she wasn't acting normally, and eventually she got fed up and stormed out, saying "I love you" in an insincere way and walked back to her sorority house.

I don't know what to do.  This girl is perfect, I seriously am in love with her and I do not want to lose her.  I can't imagine what would cause her to act like this, but I feel like I deserve some kind of explanation.  What should I do?
user
Girlfriend randomly stops responding to me, refuses to kiss me, and walks away.
assistant