I think that attachment has both biological and psychological elements to it. Whenever it happens to us, it seems we tend to repeat the same patterns learned when we first attached to our parents. Part of infant attachment to caretaker is necessary and instinctive, I think. There is no way a baby could survive without his/her caretaker so they need that attachment to survive. I wonder if the same type of thing happens sometimes in our adult relationships with others...even outside of the therapy room. Separation distress (which is exactly what I went through when leaving therapy) is nature's way of getting the infant back to their caretaker. I was so pathetic at one point during grief that I would've held a rock from T's driveway in order to feel that connection. It felt like a need...as if I wouldn't survive without him. Of course I did, but I think maybe that is the mechanism in place that makes us yearn to contact when separated from the attachment figure. I'm still kind of amazed when I recall the actual physical sensation that I felt when separating from T. It felt gravitational in a way and very, very strong. A tugging, pulling sensation in my chest/heart area...nature trying to put me back with T. It's kind of fascinating really.