Flirting

Why would this guy keep on chasing me and flirt with me but have eyes for another woman?

He is always chasing me at work and always looks at me like he is in love. But i think he have something going on with our female coworker like when she first got in our office (she was another department before) she was sharing a table with a woman then suddenly said she want sit infront of our coworker who always flirt with me. During lunch break he also cooked something, and ate it with her alone and last Friday he wanted flirt with me then saw she was coming and ran to her. And last Friday something seemed to have happened between them she deleted her Instagram account and they unfollowed each other on Insta. Should i just try avoid him now? I also notice he chase me the most when he say Hi or good morning and i ignore him

Why would this guy keep on chasing me and flirt with me but have eyes for another woman?
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