I suppose, when you have felt the high and you have also felt at an all time low, all you really want is to feel it all over again or to feel nothing at all.
So you sit on the side of the pavement just a little outside safe but just enough over the line, accepting the danger you may be forced to face.
Anxious and excited, or sometimes nothing at all and you sit there all alone until you are sitting there no more.
I think it's called overthinking, but I'll just think over that some more.