Love Island fans are in uproar over the boys' behaviour in the controversial Casa Amor game, branding the challenge 'cruel.'

Every year the introduction of the infamous neighbouring villa to the main house, with a new batch of stunning Islanders, puts relationships to the ultimate test.

Viewers have been left disappointed by some of the boys’ behaviour this year, particularly Welsh bricklayer Liam Reardon who is coupled with Millie Court but has had his head turned in the second villa by Lillie Haynes.

READ MORE: Too Hot to Handle star Nicole O'Brien reveals why she turned down Love Island

Tyler Cruickshank is keen to explore his connection with Clarisse Juliette after only being briefly coupled up with Kaz Kamwi for a few days.

Teddy Soares has been flirting while separated from Faye Winter on the lads' holiday.

And Toby Aromolaran has been getting cosy with Mary Bedford after he already ditched a devastated Chloe for newcomer Abigail Rawlings in the main house.

The only man staying loyal is Jake Cornish, who made it official with favourite Liberty Poole before leaving for Casa Amor.

But he has come under fire for urging the others to get to know the new bombshells on the ITV2 dating show.

The girls receive a postcard from Casa Amor

The girls receive a postcard sharing shocking pictures from Casa Amor in tonight's episode.

A first look teaser shows Chloe Burrows screaming in shock as she picks up the card with a selection of photos from the boys' raucous time away.

Chloe rushes to show the other girls in the villa.

Each girl looks to see a picture of the boy they’re coupled up with and in response Liberty throws the postcard in the swimming pool.

Many viewers have taken to Twitter to have their say about 'horrible' Casa Amor.

Chloe found the postcard

"Love island was a guilty pleasure for me but now it's just too cruel and horrible, it's designed to hurt girls and see their reaction for entertainment. Yeah VERY modern," complained one.

"When you actually think about it Love Island especially Casa Amor is cruel to the contestants," tweeted another.

"I’m not even watching love island anymore it’s disgusting what the f*** is wrong with boys this isn’t entertainment it’s nasty and cruel," raged another.

"Genuinely feel uncomfortable seeing the stark differences in loyalty between the girls and boys here. Absolutely horrendous," said another viewer.

Tyler is cracking on

Another said: "Don't get me wrong I love the show but I can't bear to watch these girls get their hearts broken every year it's so unfair and cruel."

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And another commented: "You’re out here loyal to the bone sharing a bed with your mate(s) and your man has practically forgotten your existence after a few kisses. Ah it’s a cruel game when Casa Amor is involved."

One of the most heartwarming moments on Love Island came when a terrified Molly-Mae Hague broke down in tears as she returned to Casa Amor to find her man Tommy Fury waiting for her with her beloved toy elephant Ellie-Belly.

Other fans think the game is a great way of determining who is meant to be together.

"Both deserve so much better," said one about Kaz and Millie.

"Hopefully this makes the girl realize that they have to move on," said another.

"Nah the way Liam’s head is GONE I’m so shook, I feel bad for Millie…Can’t wait for the recoupling," said another.