Agreed. He has to be able to explain his goals for you.

But aside from that, your description
flirting and teasing
is not what I would describe as a slut.

A slut doesn't tease, she follows through. A slut follows through because she wants cock. Because she yearns for cock. Because she needs cock. A slut is not shy about letting her need show through. All that matters to a slut should be the acquisition of cock.

That said...

Whether or not your Dom wants you to display your sluttiness to him alone or to others needs to be determined. Whether or not he intends to share you needs to be determined. Whether or not his definition matches mine needs to be determined. At least now you can go ask.