She's practically a homicidal maniac; why on earth would he want to breed with her
No, violent lunatics are all very well, of course. Great bunch of lads, for the most part; hearts of gold and whatnot. But you only get together with them in the first place because there's little or no chance of being stuck with them forever.
And P is a pinko and a cat lover so, deep down, he understands this perfectly well, even if it took over a decade for the thing to play out.