My ex is calling me love why?

I been broke up for 5 years and been dating my new boyfriend for 4 years and at work my ex now is on the same floor and has tired anything but every time he pass me he says hi love or you look lovely today I say thank you to be polite but evertime my boyfriend comes to take me out for lunch or bring me home or comes for his sister kids my ex cuts off all contact with me I mean we are still friends but why is he calling me love and cuts off all contact with me when my new boyfriend is around
My ex is calling me love why?
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