My colleague (who is more senior than me) and I work in different locations a few hours apart. He moved to the other site and now I'm left supporting the old project alone. Initially, he promised we'd both travel to see each other monthly, but now he wants me to make all the trips.
Since moving, he excludes me from important conversations and pushes his own agenda without my input. We have different skill sets, and he favors his own, altering project requirements to suit his expertise. If he knows I won't agree with him, he will simply exclude me from the meeting or process.
He also assigns himself the work he prefers on our joint project, and will often give me tasks with ambiguous deliverables, and when completed, will demand it redone in an obscure way he sees fit.
Since I am alone at my current site, and he is my only link to the other site/team/project, I feel isolated by this. Advice?