My girlfriend says she doesn't feel the same way about me anymore?

Hi, I'll try to keep this LONG story short.

My girlfriend and I have been dating for 4 years. We were high school sweethearts and have agreed to never feeling so strongly about anyone. After a year of dating we admitted to feeling love for each other and went on to have sex for the first time. We have always had a strong relationship and never doubted our love for one another. After she moved to college (25 min away from where I now live). We still saw each other quite frequently (3-4 days a week for 5-6 hours). A few months into college (a week ago) she told me that she was confused and worried about herself because she thinks she's starting to "like" her new guy friend from college (they hanged out A LOT because they don't have many other friends). I told her to take some time to think about how she feels she should handle the situation and if she's going to dedicate herself to me and me alone. 2 days ago her and I had a great weekend of fun and hanging out.I woke up the next day after our weekend and noticed she looked upset. I asked her what's wrong and she told me she had something to tell me and that it was bad. I asked what was wrong calmly and she responded to say "I don't think I feel the same way about you anymore.. I don't think I'm in love with you anymore" I asked her why.. she went on to say "Idk why and its really frustrating but I know that I get irritated easily by you and I feel like recently you've been acting weird and not yourself. I accepted what she said even thought it broke my heart in two. She had been very bipolar all her life which is how I explained to myself why she would seem so happy the night before and then wake up to tell me she doesn't love me anymore. We Both have taken each others virginity and have been in a very sexual but romantic relationship for the past 3 years (our first year was just getting to know each other). I'm very confused as to what I should do! I told her that day that we should take a break so she can figure out what she wants to do with us and our relationship, and some time to clear her thoughts. Its been 3 days now and I try to talk to her as least as I can. ( a few texts a day). She has been VERY kind to me and hasn't brought up the whole ordeal at all since. She said she cares about me more than anyone in the world and was frustrated with herself for not knowing exactly why she didn't think she loved me anymore. I don't know what to do, if I should wait for her and just keep doing what I'm doing, or tell her I want to give us another chance and see if it wasn't just me acting not myself that upset her, OR that she just wants to let go of me and find something new to give her attention in life. Please, help me get through the hardest time of my life so far. I love her and I know she cares about me enough to love me again. Please give me your wisdom! Thank you!
My girlfriend says she doesn't feel the same way about me anymore?
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