There was another girl?

I was talking to this guy for about 3 weeks the first week he was really nice always complementing me, but as the second week he started not to care and texting dry and i ask him if there was another girl and he said no. now he told me that there is another girl and i feel so fucking stupid i feel ugly and I don't know what i did wrong. i did everything he asked me to do I don't know what’s wrong w me or what to to do with myself

There was another girl?
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