Why does my male colleague treat me so differently from everyone else?

I have a colleague with whom i got on well until recently.

We had some low key flirty banter, and he offered to give me lifts to work.

Anyway, of late the mood has rather much changed.

He is a sweet guy, and whilst he is chatty to everyone else, he appears hostile towards me. He’ll talk to people in front of me and be super friendly (even people i kno he isn't all that keen on) and totallY ignore me or be much colder towards me and speak to me last.

When we are alone, he will make teasing comments , and I don’t think these are malicious but he pushes the boundaries with the ‘banter’ much more than he would with any other colleague. In fact, i dont think he has any banter at all with anyone else.

to contextualise things, we don’t work in an office. We are both busy at work and only see each other during breaks.

Further, without sounding arrogant, I’m quite attractive with a good figure and a fair bit younger than he is.
Why does my male colleague treat me so differently from everyone else?
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