How Can I Support My Husband with His Work Frustrations?

I try really hard not to let my husband irritate me. Thursday he was told he was to valuable at work to let move back into a position he really wanted to move back into. He really can't stand the guy he works next to. He has been putting up with the guy for a year. Plus he had to for a year. His old dept. wanted him back. Now he found out his working buddy gets to go back into the spot in my hubby's old dept. It has him so upset. Also the guy messages him on Facebook getting him all fired up again. I told him just to not message him any more since they aren't working along side each other. My husband and I were at bowling so it got him out of his game. His bosses told him they have a spot that is coming open for him. This hasn't happened yet and thinks it's just to keep him around where he doesn't want to be. this position he has all the learning done for it and only needs to learn very little because of his old dept. Which is where is old coworker went off to, so we think he will come back here in 2 months and will be doing the same work as my hubby again. I am done hearing about how he doesn't want to go into work or go into this spot because of this coworker. I told him to go to his HR dept and say I can't work beside him any more. He has gone to his bosses twice in one year, no one there can stand this coworker. I been trying to be supportive but I can't stand when he talks about finding another job or not wanting to go. Sorry this is really long, maybe some mommies could help me out with the problem at hand.