What does "you're not unattractive" mean exactly?

Anonymous
my friends with benefits broke things off saying she wasn't attracted enough to me anymore. Im pretty damn sure I'm not close to ugly (see my pic and post history)

I asked what she meant by that and she just said "your not bad looking but I just don't think your my type" does this just mean she doesn't like my personality or should I take this as a sign to keep improving my aperance? maybe she just meant I'm only like slightly above average looking or something?
What does "you're not unattractive" mean exactly?
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