My H got mean too and he is far from mean. I am not sure why that is, although my H did say the other night that he thinks he started being a complete jerk to me so that I would get fed up and file myself or at least go along with it. Don't let him bait you.
Would you have to put the kids in daycare if you got a job? Have you talked to him about that? I understand you not wanting to make it easier for him, but again is there any way that you can use it as a bargaining tool? Ask him to wait a certain amount of time before filing if you get a job?