If my girlfriend says Im her hero, is she telling me I saved her from loneliness or im the best thing that's happened in her life?

My girlfriend will tell me this at least 2-4 times a month. Normally at night over text before we end our chat.
I love her very much and really just want a womans point of view.
Or is it said with a hidden intention of some sort?
If my girlfriend says Im her hero, is she telling me I saved her from loneliness or im the best thing that's happened in her life?
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