My neighbor came over and showed me her boobs, What should I do?

My neighbor is interested in me, she has a boyfriend. She came over my place one day just talking to me. She started to move her shirt around. She then pulls her bra out form under her shirt. I did not know what she was doing at first. She then showed me one of her boobs and smiled. She went home after awhile. Nothing else happened. What does that mean and what show I do. Should I let her boyfriend know. I want to be peaceful with m, y neighbors.
My neighbor came over and showed me her boobs, What should I do?
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