Should I be concerned about my boyfriend mentioning a woman who tries to flirt with him at the gym?

He has already mentioned her twice to me, saying that apparently now he has a "stalker" whom he used to know from a long time ago. He's not speaking to her or anything, and I haven't given it any importance so far, but now it has started to bother me. Even though things are going pretty smooth between us two.
Should I be concerned about my boyfriend mentioning a woman who tries to flirt with him at the gym?
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