Why does my girlfriend keep stalking her ex boyfriend on Facebook?

She's been doing it for the last two years and then fo rthe last 8 months while she's been going out with me (but less frequently as time went on after we started going out)
Updates:
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she unfriended/ deleted him as a friend on facebook 4 months ago but she still searches for him and looks at his public profile
Why does my girlfriend keep stalking her ex boyfriend on Facebook?
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