Why would a girl say you deserve better than her?

Knowing that the guy is a really good guy and he really likes her.
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I used to talk to this girl a while ago. In the beginning everything was going good. We liked each other. We talked on the phone almost every other day and text everyday. Then she broke up with her boyfriend a month ago I think and everything’s just went downhill. We don’t text as much as we used to and haven’t talked on the phone since like end of December. Jan 2nd she told me she really likes me and we can have definitely have something in the future. But rn she had to pay attention to her men
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mental health and there's some things going on that she doesn't want me getting caught up in. So, I gave her space. She ended up texting me on facebook telling me why she hasn't been talking and then a few days after she texting me on Instagram telling me why she hasn't been talking and that she's been really depressed. She said she feels shitty that she stops talking to people when she's depressed. I told her i missed her and she said she missed me too. I don't know if she actually did.
Why would a girl say you deserve better than her?
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