@caseylv,
I think the word love comes in different forms. Being together since you were 14, it would be 1) hard to imagine yourself either alone or with someone else and 2) frightening as well.
But, if you were to close your eyes and visualise some guy laughing with your son, kissing you on the forehead, helping you with things in life and financially wouldn't that be a good visualisation?
That is love don't you think?
You say that you had a bad car accident 4 years ago, you suffered 5 herniated discs, ouch, I only have 1 gone and it's ok as long as I don't wear high heals too much but 5? And, you work, take care of your son, obviously do all the housework, cooking, shopping, everything.. Wow. You must be worn out and also in pain.
But I think I would like you to re-read this bit.
"He has not worked in 7 years". He wasn't working for 3 years before the accident casey..
He has a fear of you cheating and leaving him, threatening suicide, pretending that in his mind you must be or will. Steals from you as he has no money, doesn't help you as he says he is in pain, ignores you for weeks, plays mind games, ..
I understand you don't want to hurt him but that's "feeling sorry" for him.
I understand you don't want to hurt your son but you are also bringing your son up to see that nobody helps the woman and to see, his Father sleeping whilst he's awake, never playing with him. Perhaps your son would be better of with a happy Mum? With, a normal life? With the opportunity one day of having a Dad that plays soccer with him, or even soft ball throws in the lounge-room ( not putting down his disability).
I agree also that he more than likely is very depressed but the fact that he didn't work before all of this for 3 years is emotionally abusive to you, something you are used to and shouldn't be anymore, suggests that he didn't want to work before in any event, perhaps he was depressed back then from his own life dramas throughout .
We can't save wounded animals, or humans, we can save ourselves and live a happy life.
And, in that, our children.
I'd continue with therapy, remember your son needs love and laughter and even if possible a male (uncle) someone to do things with and you need love and laughter as well.