Took care of girlfriend when she was very sick. But she won't do the same for me?

My girlfriend got really sick. I took her to my apartment and took care of her full time for a couple of weeks until she got better. I took care of her needs and did all I could do to make her feel a bit better in the middle of her sickness, treating her with tenderness,i cooked hot chicken soup for her, hot chocolate, etc. Anything to give her some comfort. I just left her side to go to classes -we are in college- and to shop for groceries, etc.

Her sickness was, however, contagious -it was a virus-. And by the time she was feeling fine, I got very sick too. She however Left me completely alone and said directly to me "I don't want to see you because I might get sick again". I got really disappointed at her because she would turn her back on me when I was sick right after I had taken care of her so well.

Why would she do this? Why would she turn her back on me after I had done all I could to take care of her and even risked getting sick myself?
Took care of girlfriend when she was very sick. But she won't do the same for me?
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