My girlfriend always calls me a piggy?

She loves to call me a piggy because I'm a little chubby. I don't mind that because the way she calls me is cute but deep down I'm feeling a little insecure.

She is just teasing me, right? I'm worried if she is starting to find me unattractive or something. I've been trying to lose weight but it's going to take some time I think.
My girlfriend always calls me a piggy?
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