"We're gonna find clementime, with or without you, Lee"
"Oh, nope. Just gonna kill myself, not like I care about what happens to clementime or If Lee doesn't make it"
Really? He could have just shot Ben then go with Lee, wouldn't take long, sure the walkers would go to them, but they can't climb ladders, and they would be long gone before they could even get up.
I know Kenny doesn't got a family left, and the boat is gone, but he cared for Lee and Clementime, and I doubt he'd just forget that and die for nothing.
Why did you think he did it? Was it a legit reason? Do you think the his death was a good death or just a "Let's just get this character over with" death.