I think my boyfriend is sabotaging me... HELP!

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So 2 weeks ago he asked me if I wanted a cookie. . I said, "No, I'm going to be on the beach in 21 days!" The next day he said he wanted to "eat clean" with me. He wasn't serious about it and I kept it up alone. I lost three pounds and so this week he has been eating what I'm eating then yesterday he wanted ice cream. . . and today. . WhiteCastle. . OMG . . . help!!!!!!:ohwell: