There are many psychologically hurt SLIs out there. I know many and as far as I can tell you, only the ones with a stable family are nice to be around in the long run.
It seems to me that those who are used to be alone, to have superficial relationships with others, specially if young, tend to have this characteristics:
* Have little to no tolerance to what they dislike. So if their wishes are compromised, they tend to abandon the person or situation which forces them to choice.
* Too focused on immediate gratification.
* Low self esteem, which causes many things, but I've observed from close that they feel threatened if they are challenged in an area they consider themselves experts in.
It's like if they largely lack maturity and manifests itself as a lack of social skills. For any relationship to work, one must be always willing to give up on a part of oneself. It is simply impossible to have healthy relationships with other people if you go on with an "my way, or the highway" attitude. It's probably why I've observed that those in stable families do it much better: having a family teaches you tolerance, patience, etc.
I can only explain this by recalling what Kiersey says about ISTPs: when under stress they behave like a negative version of ENFJ.