A co-worker acts interested in a relationship with me then turns cold. He doesn’t do this with other females. Why do I get this flip flop personality?

I work with this guy who sends mixed signals. I understand this is a red flag and will not pursue a relationship with him. I want to understand his behavior better though and need input. He will take time and flirt with me then flip a switch and be cold. He then takes time to talk to other women while I am around. He is not cold with them. He is kind sweet and attentive towards them. Why am I getting treated differently? One of these other women became so jealous that he speaks with me too that she completely stopped talking to me. He will follow them on social media but not me. He will approach them but with me he will only approach me once in a while. This situation hurts.

A co-worker acts interested in a relationship with me then turns cold. He doesn’t do this with other females. Why do I get this flip flop personality?
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