Dating in 2006

When does "dating" turn into boyfriends? Are we conscious of this change in the relationship? Are there any signs of this transition? What happens when one person wants more and the other doesn't or isn't ready? Do you keep dating? Do you move on? Is it possible to casually or even seriously date multiple people? How do you know when its over? And how do you let go of the past anxieties that keep you from taking a risk on someone? What are your thoughts on this?