what are you trying to turn this into? Dragon Ball?That's just the point of Jack. To be too OP. Hell just... leave. But also, he can become loyal to someone if they befriend him. Extremely loyal.
*Ahem he's a furry dog now*
But yes, eventually, his own power will eventually crush himself. Explode, then implode, then explode all the power again. Better hope it doesn't happen on Earth, because power doesn't just disappear. His power death has the potential to knock the planet out of orbit, if it doesn't simply destroy it first.