Read the hypothetical below and then describe (i) the issue, (ii) the rule(s), (iii) how the rule(s) are likely to be applied by a court, and (iv) and the likely conclusion.

Jack is an accountant who works for the firm of Readum & Weep. Jack was approached by Ima Phool, the CFO of one of Readum's competitors, Numbers R Us. Ima offered Jack a substantial raise to leave his company and work for Numbers R Us. When Jack's boss, the CEO Readum & Weep, heard that Jack may leave, he called Jack into his office and said, "If you agree to stay with us for at least five years, I promise that next year you will receive a promotion with a 50% raise, and a 5-year contract." After considering his boss's proposal over a few days, Jack turned down the offer from Numbers R Us and stayed with Readum & Weep; however, Jack never specifically told his boss of his decision to stay with Readum & Weep. Nine months later Jack was dismissed from Readum & Weep due to corporate downsizing. Jack wants to know if he can legally enforce his boss's promise.