Sweetheart could very much just be like a teasing name. It does not necessarily mean she wants to date you, but it's definitely flirty and playful. I don't use that word often, but I'm not English speaking at home so makes sense, but if I were to speak English every day then I suppose I'd use that for my close friends, and boyfriend. I throw in random nicknames all the time.
Personally, I call a guy sweetheart only if I feel comfortable around them; 'sweetheart' is more intimate than words such as 'cute' or 'hot.' I don't think I'd call a friendzoned guy 'sweetheart.' I'm more likely to call them words such as "dude" or "buddy." It also depends--does she call a lot of people sweetheart?
That could mean anything, I call a lot of my guy friends "babe", "baby", "hun", not because I want to date them but because that is just what I do. It all depends though, if you really want to know, see if she calls anyone else by that pet name and then you'll have your answer!
It means you are a nice guy. Could mean a bunch of things past that.
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I for one, use pet names for everyone, friends, boyfriends, family so I wouldn't look to far in to it.
it could mean a lot of things I do call my boyfriend and only my boyfriend sweetheart, but its kind of our thing, just see if she calls anyone else that, its kind of like doing your research (:
When I call a guy sweetheart I only
Think of him as a friend. I’ve already made up in my
Mind that that’s all he’ll be.
Dude my grandma calls me sweetheart.
It could also mean she is being friendly.
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