What does it mean when an ex still teases me? Can we really be just friends?

Girll_With_Questions
We had broken up about 9 months ago and during that time I was overseas. After returning, I got in contact with him as i kinda wanted to get back together but he expressed that he has moved on but we could be friends.

We are now friends (share a few classes) and even call sometimes. But recently he’s been teasing me (giving me nicknames) and joking about one day I should do this or that when I meet a cute boy etc. Is this just because he’s my ex so he’d joke about it, or that he still cares/wants something more?

If your opinion is that ex’s can’t be “just friends”, what do you really mean by that? As in there will still be feelings? Or physical attraction will make ex’s break friendship boundaries?
What does it mean when an ex still teases me? Can we really be just friends?
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