My girl friend gave me a sudden compliment on my lips?

she's a work friend and we get along fine.
I was focused on my computer screen when she was walking by, she stopped at my cubicle and chatted some inane thing and out of the blue said that my lips look great. That the person who gets to kiss my lips would be really lucky.
I felt great because I've been insecure about my lips, but I wonder why she said that because we haven't been that close of friends before.
My girl friend gave me a sudden compliment on my lips?
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