You're partly answering the question, Grace.
"this is a sign of disrespect for one's self & boundaries... low/ no self-esteem."
We do not love our selves sufficiently, and again we seek self-love. We wish to be appreciated; admired ....
Again, all spring from the same old problems. They do not change, just greater or lesser in different human beings according to experience or level of awareness or Consciousness. Insecurity is there and fear also. In fact they are like brother and sister, most of the times.
There is an inner lack or disharmony, and we are doing what seems right to us, to try and solve it. Painful as it can sometimes be, I do not knock it. It's all part and parcel of the process of growth.
Nothing is ever new, and you would find that that the problems of yester-year are the same today, just seemingly taking different shapes. What pushes us, knowingly or unknowingly, is the quest for fulfillment, satisfaction. A voice tells us that we are free and we are trying to find or re-discover this Freedom.