Marvel Cinematic Universe Part II

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I thought they were just friends in the present day, they dated in the past but they were just friends now.

That's exactly how it was, but I think Stephen still carried a torch for her (it just wasn't mutual).

I guess that's possible, but by that point I was just tired of cliche Hollywood romances and I didn't find it believable

I think for the role it served in the film it made sense.

I like the actress enough to appreciate her presence and the backstory, but

I guess I don't see where she fits in with # 2, unless there is something new or revealed about her character.
If the plot concerns multi-universal events, maybe her or a variant is explored in that context. A 'verse where Doc doesn't become a Wizard might have them married or still involved.
Otherwise I think it could be a different setup or reveal ( Someone else from Dormmammu's dimension who always knew he would be come a sorcerer?)

Either that or Strange visits her before all the multiverse shenanigans.

Really? I don't think it's impossible for two people of the opposite sex to never have a romantic connection.

But maybe I'd buy it if I thought they actually looked like a couple. But the MCU isn't great at romance IMO

Well, the point was they weren't a couple anymore by the time of the movie.