I have been badly used and abused by my ex - the question is.. do I reveal all I know?!?

My ex was the very definition of a con artist, user, manipulator etc (yes I was naive and I will admit to my own fault to play in all this) but I know I am the 2nd person he did this too... This is not the first time he has done this. He lived with me and I paid for everything - and I mean everything - I was left supporting both of us under the belief that he had no cash at all to his name. After 18 months of being driven to a breakdown given the the stress I was under I broke things off (thank fuck) But........ He told me (and This has been confirmed by his family) that he was raped by 2 men years before we met (this I known be true from hip sister and parents). But.... He told only me twice that he hated himself because he found the person who instigated the rape and beat him up. To the point were he was found dead in the area my ex-bf left him. What should I do with this information?? (For the record I plan to do my homework and see if there was anything reported - but can I tell anyone?? Have I been told of manslaughter/murder?) I've only found this out a bit before the break up.. should I ask my parents?a solicitor? I'm so hurt and angry I don't even know if he made this up for me to be scared off him :S