<human>: Can you provide a brief rundown of the text in within 3 sentences?

I [M 21] started talking to and got back together with my SO [F 21] after a three month break of no talking. We have know each other for 3 years and have been off and on until recently. However during this period she messaged me a few times talking about our love and asked my roommates about me.

 So when I started talking to her again I was happy ans she was happy. However, I go to school on the other side of the state (300 miles). I come home often an now am home for a little over a month. Now for the problem. She usually texts me and one of us will call the other every night if we are not together. But recently she has made some new friends, something she has struggled with back here, but then sometimes will not respond to calls or texts for afternoons through the next morning. 

I finally asked her about it and she sent this long text about how she loved me but was not ready to be with me 100%. She does not want to be tied down and feels that if we were in a serious relationship she would be unfaithful. She feels bad that she can't give me what she think I want. I am just confused about why this is coming up now as she was the one who was more persistent in us talking and getting together again. I feel that I am being strung along a bit and don't really know how to handle this.
<bot>: SO wants be in a relationship, but not serious right now and feels that she would be unfaithful if she was tied down. I don't know how to handle the situation.