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The scaffolder, 23, was on the verge of asking the democratic services officer, 25, to be his girlfriend before entering Casa Amor.
However, stunning model Molly, who comes just roads away from him in Manchester, now appears to have caught his attention - and fans are *not* impressed.
Ever since arriving in the new villa for a lads' holiday, Callum wasted no time getting to know the new arrivals, even accepting Molly's request to share a bed with him.
When quizzed about Shaughna, so far he's done little more than nervously grimace, and certainly hasn't shut down getting to know anybody.
And in the preview for tomorrow's show, he's seen locking lips with the blonde bombshell during a challenge, before telling the boys that they have an undeniable sexual attraction.
Meanwhile, back in the villa, poor Shaughna has been nothing but loyal to Callum - who she coupled up with on the first day.
While fans had originally tipped her and Callum to win as a duo, watching her stress from the confines of the main villa, many suggested she deserved the crown to herself.
"I think I've worked out what needs to happen on #LoveIsland: Shaughna needs to f*ck Callum off and just win it on her own," one person suggested. "She's easily the best person in there. Just saying..."
While another agreed: "Can't Shaughna just win this on her own?! #LoveIsland".
A third chipped in: "Poor Shaughna, they were my fave couple, callum can now go and do one I hope she wins without him #fuckboymaterial #Loveisland".
As several others posed another solution, suggesting that she should couple up with recently scorned Luke M instead, and they should take home the trophy together.
Luke was forced to dump Jess Gale after she refused to call things off with Mike Boetang - claiming she had played them both off against each other for too long.
"Callum picking molly, leaves Luke m and Shaughna they should couple up and win #LoveIsland," one suggested.
Whatever the case, Queen Shaughna needs to be protected at all costs.
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