What to do about previous lovers!!?

Should I be OK with my girlfriend talking with guys she has been with before. We both cut off communication with all of our ex's...but what about friends with benefits? I have no idea what to think about this please provide some insight.
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If he messages her on Facebook regardless of what he says...I just think about how he hooked up with my girl. I don't know its weird but I don't feel like I should limit who she contacts with. What she did before does not matter now I don't care.
What to do about previous lovers!!?
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