My girlfriend just accepted a friend request from her ex-boyfriend. What should I do?

mytwofrogs
I was looking at Facebook the other day and noticed that my girlfriend accepted a friend request from her former boyfriend. I felt like she was going to get back together with him, or that she wanted to. She tells me that she doesn't, but that they were really good friends. What do you think is really going on and what should I do?
My girlfriend just accepted a friend request from her ex-boyfriend. What should I do?
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