My guy friend asked if I was flirting with him?

Okay I’m seriously so confused, I sent a picture of me doing half a heart over Snapchat to a close guy friend of mine and he asked if I was flirting with him, and said it was a serious question. I answered “no what?” And he never responded. I’m so confused, I don’t want him to think I’m flirting with him? Do you guys think what I sent was considered flirting?
My guy friend asked if I was flirting with him?
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