Money mule scammer.
Be very careful with anyone who asks you to connect with them on WhatsApp, especially if you meet them on a singles site, as they will ask you for your bank account details using an excuse that they can't access their bank account, and need you to accept money into your account and transfer it to another account in order to pay a bill for them. The one that tried it on me asked me to transfer a large sum of money to a mob in Turkey.
It sounds innocent enough, and it doesn't seem like you will be out of pocket, but you will be helping criminals launder money, and you can end up in jail as a result.
I didn't see any harm in it as I wouldn't be out of pocket, but my bank picked up on it and blocked my accounts while they investigated the transaction and they informed me that it was a money mule scam, and that it was illegal. Thankfully they blocked the transfer.
Be careful if anyone asks you to transfer money on their behalf.