Some broad hurt his liver and it prevents him from doing the thing he loves for the rest of this lifetime.
He contracted hep b and couldn't wrestle for six months, then TNA let him go;
"McGuinness had actually tested positive for Hepatitis B. (Hepatitis B is an infectious inflammatory illness of the liver that can be transmitted by blood or body fluids like semen. Unlike Hepatitis C, there is a vaccine.) He was prescribed an anti-viral medication and within six months, he was clear of the disease."
Also, WWE rescinded their contract offer to him because he wouldn't get surgery for his old bicep injury. If I remember rightly, he cited the cost and a general despondency with the whole ordeal as the reason why he didn't just get the surgery done and try for another shot at WWE.
Regardless, I think it's great that McGuinness has been campaigning to raise awareness about perils of concussions and intentional bleeding in wrestling, but he wears his frustration and bitterness on his sleeve. Perhaps you can't blame him for that, given how his career panned out, but it wears thin after a while.