If my boyfriend is good friends with all his exes, should I be worried?

every woman he has had something to do with are all his friends. some even know each other, they are all on his Facebook. should I have a problem with that. he makes them more important than me, our relationship. he even said one time that he wouldn't ruin his relationship with them, his exes because of me. is that a clear sign for me to move on.
If my boyfriend is good friends with all his exes, should I be worried?
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