3 mo

What does that “oh” mean?

I had been talking to this guy and I had called him a f******* J***. I don’t think I should have called him a jerk even though he had been acting like one by ignoring a sensitive text I sent. While seeing him active on social media. I shouldn’t have been that extreme. Anyway he told me that he had just woke up from a nap and to please delete my number. A few weeks later I text him to apologize...
me: hey
him : who is this
me: nevermind
him: I got a new phone (HE didn't GET A NEW PHONE)
me: I’d rather not say who it is
him: kool
me: I didn’t mean to call you a fucking jerk
him: tell me who it is then stop texting my phone
me: chels
him: oh

And another thing... !!! Because he didn’t use punctuation. Does he mean “ tell me who it is *and THEN stop texting my phone or tell me who it is then because you keep texting my phone?
What does that “oh” mean?
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