The first of two special episodes of The Only Way Is Vegas kicked off last night (6 October), where it was revealed that Mario was back on good speaking terms with Lucy.
Despite Lucy confessing that Mario has been trying to win her back, the brunette confessed to Reveal that she enjoyed a holiday romance with one of her co-stars in Vegas - and it turns out that person was Tom!
In a preview of Wednesday's forthcoming episode shown last night, viewers saw Lucy lock lips with Tom, which has left Mario devastated.
After the show, Mario took part in a Twitter Q&A. When a fan asked how he felt at seeing Lucy kiss Tom, he replied: "Heartbroken. It's the first time I've seen Lucy kiss another person."
Lucy and Mario, who split back in April, had a bitter fallout on the ninth series of the show following Mario's admission to cheating on her during their relationship. But by the finale, it appeared that they had managed to put their differences aside.
Last night, Mario also confessed that he was ready to settle down. He confirmed to fans on Twitter last night: "It is true... I am ready to settle down! Have learnt from my mistakes, I was a complete twat! Now hoping to meet someone x."
Meanwhile, Tom teased: "So much went down in Vegas... Just wait for episode 2! #TOWIV."
TOWIE's second Vegas special continues on Wednesday 9 October on ITV2 at 10pm.