When I was still addicted to alcohol until about December 2017, I used to feel I had two personalities called "Dr. Jekyll and Mr. Hide" - the former was active when I was sober, while the latter was awakened every time alcohol started to influence me - and wonder which of these personalities was my true self.
Since I started learning the teachings of Eckhart Tolle and Chabad Hasidism, which incidentally show amazing similarities and even commonalities, I got aquainted with the dichotony of the ego and the soul, which are equivalent to the animal soul (הנפש הבַּהֲמִית) and the divine (הנפש האלוקית) soul respectively in Chabad terminology and came to realize that Dr. Jekyll and Mr. Hide actually stem from the same source, the ego though the former can descend even below the level of the ego and the latter can experience rare lights of the soul.
So the constant struggle between Dr. Jekyll and Mr. Hide inside myself was nothing but a whirlwind in the illusory part of myself. The true constant struggle is between the ego and the soul. I gradually started to wake up and realize that my life was controlled by the ego even when I was sober and hijacked by it when I got drunk, causing sufferings to myself and people around me. But it seems that sufferings are here with us until they become unnecessary by serving their role as spiritual wake-up calls.
I still have a long way to go until I tame my ego, but I'm at least aware of its existence and its possible control of my life. The more I work on this new life-long project of taming my ego, the more frequently I can catch it and prevent it from hijacking my thoughts, emotions and actions and the more frequently I can identify people whose behaviors are controlled by their ego.
It's a torture if I have to seem them and their egoic behaviors on a regular basis. On the one hand, I feel compassion for them as I'm deeply concerned that this might eventually cause sufferings to themselves and people around them sooner or later. But on the other hand, I also feel helpless as I know from my own experience that I'll only worsen my relationship with them by telling this to them as an effort to let them become aware of it as a kind of time bomb that might explode at any moment, so I can do nothing but just watch them.