Pluto in the Third House or Gemini: emotional trauma can occur for the following causes:
1. When the water tight intellectual constructions that define not only these individuals' sense of reality in general, but also the very core of their emotional security which is based on their intellectual constructions, becomes unraveled through intense, cataclysmic life experiences. The nature of these cataclysmic events forces them to change their way of thinking, of how they have understood the nature of things.
2. Emotional trauma can also occur when these people experience intense intellectual confrontations with others that poke holes in the water bags in such a way that they have no choice but to question their underlying assumptions about the nature of reality. Once the underlying assumptions are questioned and changed, the rest of their complex intellectual network also falls and changes. The emotional trauma is defined by a core instability and insecurity because of the need to change the nature of their intellectual framework, and how they communicate their ideas and opinions. The period of insecurity or trauma is defined by the amount of time it takes for these individuals to evolve into new ways of understanding.
When Pluto transits the Third House, forms stressful aspects through transit to natal Mercury, or to the planetary ruler of the Third House, or to planets in the natal Third House these issues can be generated with the subsequent trauma.
I'm mentally very flexible and adaptable... so making changes in my way of thinking never felt traumatic to me...
Pluto in the Eighth House or Scorpio: emotional trauma can occur to these individuals for the following causes:
1. When life conditions are created in which they experience severe and intense betrayal, and violations of trust.
2. When they experience being intensely used and manipulated by other(s).
3. When they experience intense sexual violations and misuse of such energy.
4. When they experience intense loss of those that are closest to them.
5. When life conditions are created in which they are forced to examine their own motives, intentions, and emotional agendas. This examination, at some point, will uncover the subtle and not so subtle ways in which they have manipulated others or situations in order to gain something that they need or want. The light of emotional honesty creates a cruel glare that exposes the inner lies that they create for themselves and others.
When Pluto transits the Eight House, forms stressful aspects to Mars and/or Pluto through transits, to the planetary ruler of the Eight House, or to planets within the natal Eight House it can generate these issues and subsequent traumas.
I experienced betrayal, i lied and cheated in the past (but I was younger), it never came out, but may be cause i didn't continue the lie, i stopped the relation i was having, a few days after I cheated on her... I didn't want to manipulate or lie, although i wasn't honest about the reason of our break up...
Although I believe ppl aren't made to be monogamous, I became more prudent in relations since then and having a fear of relations... My belief in ppl not being monogamous doesn't give me the right to chase every skirt in town and i'm far from promiscouos (by my own standards)...
So may be the trauma here is having a fear of relations for the moment, knowing how I can be, knowing how I can be played by the other, and that paralyses my lust for relational contact... But one night stands don't do it anymore for me...
Oh well, may be I should learn to amuse myself and letting go of all these fears... And every experience is a good experience...
May be it helps that Pluto only makes a trine to the Sun, he is good aspected (if you don't count the 45° to Uranus and the quincunx to the MC)... So I'm not a very traumatized soul... I try to look at life positively and sometimes it helps...