What is an INTJ male like when in pursuit (dating, courting) as opposed to after the pursuit is over (once he is married)?
Good partners are few and far between for INTJs it seems, they would likely try to make their relationships last.
However I expect you’re not going to find the INTJ man is the type to shower you with superficial and “official” sorts of affection at designated moments, he isn’t the type to go overboard on Valentine’s Day (such a successful commercial grift as Valentine’s Day probably makes him feel slightly disgusted if he’s following it like a sheep), or to feel like engagement and marriage is that big of a deal (remember, he’s an introvert, he doesn’t desire attention-seeking or to go through social motions garnering attention and expectation). He would probably be the type to marry late with a partner he’s been with for a long time, and to make it a private event.
He’s not going to play “the game” as much as the average man, he’s going to play his own version of the game which usually involves mutual respect and mutual boundaries, absolute loyalty and trust. It’s not going to be a “fun” game to him, it’s serious business. Typically he will be the same all the way through between the dating and the marriage phase. INTJs tend to be very consistent people. You’re not going to see love bombs or extravagant declarations of devotion in the beginning, nor is it that likely you see him bugger off later for affairs with random people if he got “bored” after 20 yrs. He’s going to be himself I expect, the whole time, and you’ll have to love him for who he really is, not a pretence, or there’s just no point.