Guys are hitting on my girlfriend on face book.

what should I do?
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one says '' we're getting 90+% on quizzes, we must be totally clone-like, =)''

and another said'' I love animals to I love people who love animals. =), hugs and kisses''

these are just 2 of them,

am I over reacting?
Guys are hitting on my girlfriend on face book.
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