... order to ensure each person is familiar with each position.
My coworker always complains that his job is incredibly busy and puts in for overtime. When we switched, I was able to work within an 8 hour day on the first week of doing his job. He went around telling everyone that my regular job can be completed in an hour (but then still put himself down for overtime)
When he realized that it's starting to look like he has been putting in for unnecessary overtime, he started on this "strategic helpfulness" kick and is now telling everyone how I should be helping him with his regular job, the way he's suddenly helping me since the switch.
I know this is leading up to him attempting to shirk off more of his responsibility onto me. He is known to be lazy and manipulative. I've made him aware that I know what he's been saying about me, but he continues.
How can I deal with this?