Mark says after his divorce, he joined an online dating website where he met “Kelly Smith,” whom he describes as attractive, honest, decent and kind. He says “Kelly” told him she was Canadian but living in Nigeria as she tries to move her multi-million dollar inheritance to the United States. Mark says she agreed to give him 50 percent if he would help her get the boxes of cash, jewelry and diamonds from Nigeria to the United States.

Over the last six years, Mark says he has sent more than $750,000 around the world to help “Kelly” – but he still has not received the boxes.

WATCH: Man Who Has Sent $750,000 To Help Woman He Met Online Learns Truth About Email Exchanges

In the video above, Dr. Phil reviews a text message conversation between Mark and “Kelly” a few days before he came to the Dr. Phil show. See why “Kelly” told Mark he will regret appearing on the show – and how Mark responds.

And on Tuesday’s episode, see the results of Dr. Phil’s international investigation to determine where the boxes are. Is Mark being scammed? Check here to see where you can watch.