Lydia lashed out at Arg at a group game of rounders as she revealed he had been drinking again.
After Arg arrived late to the game and made a passing comment to Lydia, she shouted: "The reason why I'm p***ed off is he's f***king drinking again. No one knows what I'm dealing with with that boy."
Lydia stormed off in tears leaving co-star Georgia Kousoulou to console her.
Meanwhile, Arg told his pals: "The other night I had a drink and I shouldn't have had it. I went back to Lydia's and we had a barney. Yesterday I was trying to ring her all day long, and I spoke to her today and we said we were going to come here together. I made a stupid comment and it caused murders."
Still upset, Lydia told the girls all about their previous argument: "He was implying that I had been to after parties and was paranoid that I had been with other guys. As we all know, he's in recovery. I was really upset and angry. Then today he starts being mean saying I have a big forehead.
"He should be apologising. I can't babysit him, I can't be his mother. Regardless of what he's put me through, I treat it as a fresh relationship. Don't accuse me of things I would never dream of doing."
Later on, Arg - who admitted that he was living back at his mum and dad's - went to visit Lydia to clear the air.
His childhood sweetheart Lydia said she was fed up of him not sticking to his promises.
"Your behaviour recently has not been good at all," she told Arg. "I'm not having my life being a rollercoaster where you're being vile. I've become your girlfriend, your counsellor, your mother and that's not my roles."
An apologetic Arg - who entered rehab last Christmas following excessive partying - replied: "I do get it, it's not like I can't see where I've gone wrong. I need to make more of an effort around the house.
"I won't drink again. It's f**king hard," he continued. "The rest of the stuff I need to sharpen up on and I won't drink again. Sometimes I love the fact that you're this strong independent woman but I feel like I've had this absolute spanking."
Lydia gave Arg his keys back before the pair shared a kiss.
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