How to deal with a very moody and unpredictable girlfriend?

xdarkx12
Hi, so this is my first question here and I have a tough one.

Well I have this girlfriend, she is unlike most girls.

To start of we have been together for almost a year now. Everything was good until the past month. She started acting really strange, her mood shifts not by the day but by the hour. One minute she is happy and acts like she is in love with me the other she is crying.

Now for details.

About a month ago, overnight she changed started not talking to me not caring. Which lasted for about a week. I was quite persistent in making her talk, and when I was on the break of not caring she showed that she didn't want to end the relationship. Everything returned to normal in a few days and it seems that I got her back.

Now she was really happy the last day, we talked endlessly and were deeply in love. But the day after she was just ignoring me, I asked her what is with her, but she did not say anything, was like "why do you even try we are going to break up anyway" ironically and laughed. In a few moments she bursted in tears. I tried to hug and make things better, she only said that I didn't do anything. After she seemed happy again we were talking and not caring. We had sex, kissed, played a bit, and again she just laid on the bed again and seemed like she was going to cry. She barely talks to me again and I don't know what's the matter with her.

I tried talking with her countless times, she is extremely enclosed and never talks about her feelings, she hates when I ask about them.

Perhaps she has cheated on me and feels guilt? I asked her if she has she just waved her head sideways, like saying no.

I can provide additional detail for this matter if needed.

Any advices? I feel really lost.
How to deal with a very moody and unpredictable girlfriend?
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