Should I be concerned?

I have been seeing this guy for three months and he recently mentioned that there were a couple of girls he was talking to before meeting me and that they kinda drifted apart or ghosted eachother. And that he noticed then in his contact list so he sent them the "it was nice to meet you, best of luck in your future endeavors" and deleted the contact. A part of me thinks it's sweet but another part of me wonders if it was needed after 3 months. Is this a cause for concern? It's been going well with us and he says he is happy. Am I overthinking

Should I be concerned?
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