What does he mean by “no that’s not true?”?

I said Ever since that last Saturday you were supposed to come over I’ve been so indifferent like I don't know what it is.. not mad or anything like that.. and i don’t think you’re a bad person lol i just been indifferent


He said : different like how

I said : not different indifferent


He said ; no that’s not true

What does he mean by that’s not true?
What does he mean by “no that’s not true?”?
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