I have been talking to a guy online from Hungary and it's gotten to the point where he's getting really obsessed with me. He gets anxious and scared when I don't get online and start talking to him exactly when I say I will, he and I talk everyday, sometimes for hours, with him staying up all night to do so, and he wants to do things all the time with me (i.e. playing video games together).

I'm thinking about setting up some boundaries but I don't know how to do it exactly. Any advice?