A DEVASTATED man watched his girlfriend have sex with a co-star in one of the most X-rated scenes in the history of dating shows.

Spanish reality series La Isla de las Tentaciones sees couples put their relationship to the test by entering separate villas full of singletons.

A man and woman on Temptation Island.

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A reality star was forced to watch his girlfriend have sex with a co-starCredit: X
Couple in bed at night.

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Anita cheated on her boyfriend with fellow Islander ManuelCredit: X
Couple watching a screen on a beach at night.

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Her mortified boyfriend José watched the pair get steamy on a big screenCredit: X

And one shocking clip from the wild show has has gone viral.

In a new episode of the programme, which translates to Temptation Island, José Carlos Montoya watched a live stream of girlfriend Anita Williams getting intimate with her single co-star Manuel.

A devastated José witnessed the shocking moment from a big screen while standing next to the show’s presenter.

The heartbroken contestant fell to his knees, grabbed his shirt and then ran to confront the cheating pair.

He tried to storm into the villa where his girlfriend was, but crew and security stopped him, leaving the mortified star screaming.

The presenter tried to calm him down, saying: “Montoya, por favor!,” which translates to “Montoya, please!”

The outrageous moment has now been viewed more than 110million people on X, formerly known as Twitter, and people are desperate to find out what happened next.

As it turns out, Anita regrets the infidelity and begs for his forgiveness in the next episode.

A shamed Anita initially screams: “You destroyed me, you will regret it for the rest of your life.”

But she later goes to find him on the beach where they hug and he asks her to go home with him.

The host then reveals that the rule break will have consequences.

This is when a contestant, who is supposed to be staying faithful to their partner while separated on the show, engages in a physical act with one of the single people.

This essentially breaks the unspoken rule of not cheating during the “test” of their relationship.

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Although Anita cheated, earlier in the series José received a lap dance from a girl and they shared a kiss.

La Isla de las Tentaciones is based on the US reality show Temptation Island.

Couples who are already in established relationships are sent to the Dominican Republic for the ultimate test.

Once there, the couples are split up and made to live in different luxury villas with single people.

Incredibly, the singletons then have to pull out all the stops to make those in a relationship have an affair.

The US version of the outrageous reality show went off air in the States in 2003.

However, it has proved to be so popular in Spain that it is currently in its eighth season.

The clip of José watching Anita get hot and heavy with her co-star has stunned social media users around the world.

One Brit Love Island fan wrote on X: “Oh damn….Love Island has nothing on this. Spanish makes everything 10x more dramatic.”

Another added: “What love island wishes it could be. i need to know what show this is so that i can tune in tonight (i don’t speak spanish and i don’t care).”

And a third said: “Ngl until this morning I had never heard of montoya or whatever this Spanish love island is, but now it’s EVERYWHERE.”

Person running along the beach at night.

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Jośe sprints along the beach to confront his cheating partnerCredit: X
Person sleeping under a blanket in bed.

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The pair are under the covers when they begin to hear him shoutingCredit: X
Person running at night past palm trees toward a house.