A dramatic teaser aired at the end of Monday night's episode left fans wondering what Adam Collard could possibly have done to incur the wrath of love interest Rosie Williams.
And the real reason behind Rosie's tears has now been revealed - discovering her partner flirted with newcomer Megan Barton Hanson while expressing doubts about his relationship with her.
The Welsh solicitor will be left distraught to hear that despite sharing several passionate kisses with Adam, his wandering eyes have struck again.
The course of true Love Island never did run smooth: Rosie Williams will discover her partner Adam Collard tried to flirt with newcomer Megan Barton Hanson in shocking scenes set to air on Tuesday night's episode of the ITV2 show
In scenes set to air on Tuesday night, Adam admits he is jealous that blonde bombshell Megan hasn't shown any interest in him so far, instead picking Niall Aslam, Eyal Brooker and Dr Alex George to go on one-on-one dates with.
A teaser clip shared on the Love Island app shows the Geordie lad confessing he fancies Megan.
He tells the other boys: 'She's f**king mint. She is fit though isn't she. You can't say you don't have a roaming eye in here.'
Speaking in the Beach Hut, Adam elaborates: 'Obviously... she is very nice. If I was to say I wasn't looking at her or have an attraction to her, I would be lying.'
Distraught: It's no wonder Rosie gets emotional after hearing that Adam was expressing doubts about his relationship with her, branding her clingy and 'on top' of him all the time
The strapping star then corners Megan for a flirty chat, during which he makes his interest in her clear and admits being unsure about 'clingy' Rosie.
'Why would you not pick me for a date then yesterday? Was it because of Rosie?', he asks.
Megan replies: 'You'd been with Kendall, then Rosie. I thought, I'm not going to be the third! What about you, are you happy with Rosie?'
The newcomer is left shocked when Adam answers: 'It's a bit of a funny one you know. It's good, but sometimes she can be a bit on top of us....'
Ladies' man: In scenes set to air on Tuesday night, Adam admits he's jealous that blonde bombshell Megan (pictured) hasn't shown any interest in him so far
Look peachy in Megan's House Of CB swimsuit
A new series of Love Island guarantees two things: plenty of dramas... and plenty of swimwear inspiration! Thankfully with summer just round the corner we could really do with the latter right now.
We love this peach number spotted on Megan Barton Hanson, from the pretty pastel colour to the risque lace-up front.
When a swimsuit is this stylish, it's a shame to confine it solely to sunbathing activities so you could also rock it with a pair of denim shorts too!
So click right now to shop Megan's exact one-piece now, or head to the edit below and have a browse through the lovely lace-up picks by Boohoo, New Look, Lepel London and Love Stories.
'I just feel in a weird headspace after speaking to Adam. Rosie's a lovely girl, I think it's really sneaky the way played it', Megan muses in the Beach Hut.
A true girl's girl, the former stripper immediately warns Rosie what Adam has been saying behind her back.
Bursting into tears, Rosie is consoled by her friends in the dressing room.
'I think hes scraping the barrel to find excuses to move on because he just wants to f**k everything in here', Megan tells her.
Rosie sighs: 'I think any new girl that comes in here, he's going to want her'.
Megan reassures her new friend: 'I literally haven't even spoken three words to him.'
'He might have made the biggest mistake he's made in here', Rosie says, before heading out into the garden to confront the love rat.
Things go from bad to worse when Adam accidentally reveals he's also been talking about his waning feelings for Rosie to Jack.
Rosie perhaps shouldn't be surprised since Adam - who has been branded a 'snake' by viewers at home - unceremoniously ditched his previous partner Kendall Rae-Knight the second Rosie expressed an interest.
Drama: Monday's Love Island cliffhanger teased a huge bust-up between Rosie and Adam
Wandering eyes: Rosie perhaps shouldn't be surprised since Adam unceremoniously ditched his previous partner Kendall Rae-Knight the second Rosie expressed an interest
On Monday night's teaser, Rosie was seen being comforted by villa pal Georgia Steel after finding out what Adam has done.
Narrator Iain Stirling hinted further at the bust-up, asking,'Is someone hiding a secret?'
Rosie confronts Adam in front of the whole group, demanding, 'Do you want to tell me something?'
She continues: 'Something that happened today that you should have perhaps had the balls to tell me before.
Secrets exposed: Rosie confronts Adam in front of the whole group, demanding, 'Do you want to tell me something?'
Adam then sheepishly asks: 'What you on about?' while the rest of the islanders look on in confusion.
Doing her best to keep a level head, Rosie responds: 'I dunno, what am I on about? Everyone else in the group knows about it, you may as well share it. The group's waiting.'
Clearly devastated, Rosie breaks down in front of the other girls, sobbing,'I don't get why I'm not enough for someone...'
Upset: Clearly devastated by the secret Adam's been concealing, Rosie breaks down in front of the other girls, and through tears says: 'I don't get why I'm not enough for someone...'
Helping: Rosie is comforted by villa pal Georgia Steel, who is seen to be shocked about what the brunette beauty revealed as she gasps 'Are you serious?'