<human>: Could you distill the essence of the text into 1-3 sentences?

__UPDATE__: I am not going to say anything, to either of them. 

I'm not a trained psychologist or anything, but I though this guy was off, but as I got to know him better it became clear that, he is a sociopath.  

  * Impulsive
  * Very Glib
  * Does not follow rules
  * Hostile to authority
  * Several other things that lead me to believe this

Anyways, L is now dating J the sociopath, and they are 'madly' in love.  L the woman is not a very tightly wound person, and has gone in deep with him, they are buying a house together, engaged after only 3 months, and for all I know already trying to have babies.  

I am disinclined to tell L about the problems with J as I know she will think I'm just making shit up.  I feel bad as it might help her pull out a little sooner if she at least hears it from someone.  However I would like to keep a relationship with both L and J and this would end this.  My fear also is that I will essentially be declaring war with J and maybe L, which could involve 20+ people in my community, and J will use all lies possible, (no honour).  Sociopaths are notorious for being very vindictive, and hate it when they are exposed.  

So should I hang the consequences and tell her, with little benefit to herself or myself, or just let sleeping dogs lie??
<bot>: Friend getting in deep with sociopath, I could tell her, but it would do little good and would cause lots of bad drama.