My girlfriend treats me badly, why and what do I do?

My girlfriend is always putting me down and makes it necessary to point out my flaws. Little put downs throughout the day and never builds me up. This has started to take a toll on my confidence think. I think I love this girl but this is really hurting me on the inside. I do as much as I can for her , but she doesn't seem to appreciate anything. I feel like I'm in a no win situation here. Any advice?
My girlfriend treats me badly, why and what do I do?
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