When a guy calls you "dear" but his tone is off?

A guy I know always calls me "dear" now. It's a rather new thing that started over the summer. Not sure if he's saying it as a "pat on the head" term (which it sometimes sounds like) or as an old couple would (which it also sometimes sounds like). He uses it more and more often now and I just ignore it because in some respects he's sweet and other respects he's rude. I'm not sure if he's just messing with me.

When a guy calls you "dear" but his tone is off?
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