Deep sea and a toolbox
INFJ pours their heart out; ISTP fixes the wobbly chair. That is ISTP comfort.
They'll see this match write-up. Your test answers stay with you.
These two
INFJ × ISTPISTP shows care through actions, while INFJ wants to hear it in words. So INFJ piles up "do you even care?" and ISTP piles up "what more am I supposed to do?" Still, you both need real alone time and respect each other's privacy, so the comfortable distance between you fits well.
To make it lastINFJ, count what ISTP actually does. ISTP, say it out loud now and then.
Each on their own
You don't date just anyone, but once you're in, you're all in — you'll notice the slightest change in their tone. The catch is waiting for them to guess what's wrong. Say it while it's small.
The Quiet FixerYou show love by doing — fixing things, picking up what's needed — but rarely say it first. You last longest with someone who respects your alone time.