So let's take this back to the basics of your OP, shall we?
Which 'lies' has your family blown your life up on? What do you mean by that statement? It's very vague.
And what 'truths' should you blow up their lives with?
You ask us to tell you whether or not you should, so how about we get some useful background info?
So far we know that your son has high functioning ASD, a masters degree but is depressed, suicidal and cannot work. But your ex and your mother don't seem to think it's quite the issue you do.
You have a serious eating disorder and live on disability benefits. Your son lives on disability benefits. You do not consider him capable of living independently but you are not well enough to act as his carer, although he currently lives with you.
You want him to live with his wealthy father, even though you say his father manipulates him. Manipulates him how?
You say your mother also manipulates him. How?
You say your ex and your mother hate one another but are united in their agreement that you are the problem but you don't say how/why.
You say your ex is not at all practical and cannot help your son to learn any life skills or to get into work. You say that your ex will throw money at any problem. Yet you also say that he personally came, at your mother's suggestion, to re-decorate your son's room. So he isn't practical, but he didn't throw money at a professional decorator for that? 
How has he caused 2K worth of damage by attempting to decorate a room in your council house?