The pair have a war of words over love interest Louis Thompson after Spencer discovers his new co-star had tried chatting her up.
Watch the clip below:
"You said something to my girlfriend that I really didn't really appreciate," says Matthews.
"I can tell you right now, man to man, [our relationship] is fine. I care about her. I love her... You should respect that. We are solid."
He adds: "If you want to crack on to her and go head to head, you're going to f**king lose
"If you f**king go near here again, it's going to f**k up."
Jordan, Sophia Sassoon, Sam Cussins, Stevie Johnson and Ianthe Rose Cochrane-Stack have joined the Made In Chelsea cast for its fourth series.
Made In Chelsea returns on Monday, October 15 at 10pm on E4.