He's been a prick and a creep and a completely entitled jerkoff since college. Now we can say he wasn't mentally right although that is a leap because he's never had mental issues, he's just been a jerk. I'm sure you have heard about the golf course incident with the young lady.
See what happened is he just discovered that enough harsh treatment can make a person cave in. He just learned, and I find it ironic as hell that he is saying essentially the same thing Martin did, that there is a point where "enough is enough", that he can't take the mental stress and pressure. This is irony at its finest and I feel ZERO sympathy for Incognito. In fact he is as unsympathetic a person as one could imagine.
I also think that there is a possibility he is doing this under guidance, probably from his agent, to show contrition so that people will feel like he has learned his lesson. I'll bet big coin that he issues a public apology to Martin and says he now understands what it's like to go through that kind of thing. After all this is the same guy that leaked fake text messages to try to make himself look like less of a DNA rifle when the sheet hit the fan to begin with.