Why does my girlfriend think she is not worthy of being loved?

I recently got into a relationship with this girl. We were friends for over 2 years and then in January this year we started going out. Before this, she was in an abusive situationship where the dude was already dating someone else but just had her around for fun.

My girlfriend got out of the relationship and recently she was doing well, saying I make her feel what being really happy feels like. But, recently she got sick and in order to make her feel good, I said it will be fine. But she felt bad because she felt I was undermining her problems. We made up again but during the argument she said it was wrong of her to think that someone will accept her for who she is and she is not worthy of being loved. This really bothers me. Any suggestions how I can make her not feel this?

Why does my girlfriend think she is not worthy of being loved?
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