Lu Chi didn't have much contact with her, just two or three times, and the impression he left was that he was a gentleman on the surface. In the disaster zone, he could disregard whether Guan Kunling was wronged for Li Qiong'er. When Jiang Jinghuai was out on a mission, Lu Chi even spoke some inexplicable words to her, each sentence full of hostility. She took this as a sign of Lu Chi's discord with Jiang Jinghuai.
Moreover, Lu Chi was particularly fickle. He clearly had a wife, yet he constantly showed interest in Guan Kunling. She thought this was just him being unfaithful because his wife wasn't around. Men, after all, are creatures governed by their instincts. But what made it worse was that he was fixated on Kunling. Kunling was skilled in Martial Arts; while she might suffer verbal abuse, she definitely wouldn't lose out physically.