it could be a scam. You can request transaction ID and do the check yourself. if it's true that he sent the transaction, maybe it's still pending, but I don't think sending bitcoins is pending for too long. however, the recommendation that we can give is to check the transaction, so you can really know whether the transaction was actually carried out or not. You can provide your wallet address to check here, or the transaction ID so that our friends on this forum can help you.