Once you STOP pursuing him and arguing he WILL try to BAIT you into a fight.. He likley feels guilty at some level and picking fights with you helps him justify leaving...
He will think : "We can't get along see? I tried... And we just fight.. so my affair is the best course of action"
You want to AVOID him to reduce the amount of fighting that happens.
Don't say anything to him that isn't scripted out.. Don't tell him what your plans are or anything... Just stay away from him.. IF he starts to harass you get out of the home and go to a bookstore or soemthing quiet...