Is it wrong to tell him?

So a while ago I asked this guy I liked and I knew he used to like me (maybe still does) if he was single or not. He wasn't (they had just got together that day) and he asked why, I said just curious. Well we talked again today and I asked how it was going with that girl, he said they were on a break.. so would it be wrong if I told him the real reason I asked if he was single or not?
Is it wrong to tell him?
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