In what could be the worst case of Catfish ever, a man thought he had been dating Katy Perry for six years.

A very gullible Spencer Morrill was convinced he was in a relationship with the Roar star, despite having never met her face-to-face and only ‘speaking’ to her on the phone once.

Appearing on MTV’s Catfish, he gushed to the presenters Nev Schulman and Max Joseph: "It was an immediate connection. A million 'I love yous' back and forth. It was pretty cool.

"I would like to meet face to face and see if there's a future here."

He added: "She’s awesome. Katy's funnier than I am, she's smarter than I am. I don't know how many people give her credit for that, but she's very intelligent. Katy's full of life, huge heart.”

Spencer thought he’d been exchanging emails and texts with the pop star on a regular basis and he even made her an engagement ring which cost him “25 per cent” of his savings.

(Image: MTV)

(Image: Getty)

Their one phone call even set him back $270.

After some digging, the presenters traced the number and email address to a woman named Harriet who lived in Gloucester, England.

But Spencer didn’t want to believe he'd been catfished and needed some convincing from the presenters.

"We've found the person you've been talking to beyond really any shred of doubt, and you still want to believe the thing that makes you happier,” Nev told him. "You need to know that you're not talking to Katy Perry.

"And you [Harriet] need to start thinking about the fact that this is the actual human being. As weird and crazy as he might be, he has a heart and was giving it to you 100 percent for six years of his life. For both of you, there's some self reflection that needs to happen."

(Image: Instagram) (Image: Instagram)

Harriet eventually apologised to Spencer and they parted on good terms.

"For me it was enjoyable," she said. "But there's also that kind of realization that I've lost myself in that... I just got to a point to where I couldn't imagine like not talking to you... I've been through some tough times throughout the time we've been talking the past six years. Like my dad died two years ago/"

"I'm like genuinely sorry," she added. "I can't change what I did, but I understand that it was really wrong."

While Spencer said: "I’ll be okay. I'll be fine. The bad's in the past. What's ahead will be good."