Having read the manifesto, which gives a lot of insight into what he was thinking, it doesn't sound like he was regularly seeing any therapists. Sounds like he very occasionally saw a psychiatrist when he was home on a break at his parents', and then his parents had hired a service to provide him with some young people to help him develop social skills. They would talk to him and go out with occasionally to try to help him interact socially.
It's hard to know how well to trust his manifesto, because he was obviously extremely narcissistic and delusional, but it doesn't sound like he told many people (including his family) about his hatred for women and his plans for violence. The one or two friends that he expressed his emotions to honestly cut off their friendships with him--I'm sure they were frightened by what they saw. He was lying to his parents about going to college--taking their money to live on, but not attending college--even though they thought he was.
Besides being obsessed with sex, he was also obsessed with getting rich (as a means of attracting women to himself), but had decided that his only way of achieving that was to win the lottery (because he was convinced he wasn't good at anything). He spent thousands of dollars on lottery tickets and would plunge into a deep depression every time he wouldn't win.
It sounds like his parents were aware that he had a lot of emotional issues, as he clearly expressed his social anxiety to them and would often get upset and cry about many things. But it isn't clear from the manifesto whether they had any idea about the rage that fueled him, or that he had bought several guns, etc.
He also doesn't mention having therapists when he was younger, even though it sounds like his emotional issues were present from a pretty early age.
Sadly, the main advice he seems to have gotten from various people (at least based on the manifesto) is variations on The Secret book--if you imagine yourself achieving success and believe it will happen, you will manifest your own happiness, etc. He spent a lot of time imagining his delusions and then being maddeningly disappointed when it didn't work. It's all incredibly sad and horrific.
I can't imagine what his family is going through reading that whole story of his life (from his warped perspective)--or what the families of those senselessly murdered are going through. All of it is such a waste.
