Is it a 'meaningless semantic difference'? If I told you I would give you X if you did Y for me, but after you did Y I refused to give you X, did I steal from

Is it a 'meaningless semantic difference'? If I told you I would give you X if you did Y for me, but after you did Y I refused to give you X, did I steal from you? What if I told a prospective client of yours a lie about your abilities and they didn't hire you; did I steal from you?