Aditya called Archita Ranbir's ex gf ?!!

When Aditya was trying to explain what's going on to Pooja after she caught him talking to that girl, Aditya says" Ranbir ki Ex Girlfriend Archie beech mein agayi"...and Pooja says "but then..Ranbir said he loves Kanya.." So I was just wondering what's the whole deal with Aditya calling Archita Ranbir's ex???😕 😕😕

[ I hope she's not his ex, cuz then she's gonna ruin the whole story]