How do you do it?
What does that reassurance look like? Men, when you’re upset and need space, reassure your wife that you love her and that you’re going to be fine, before you pull away. Tell her something like, “I’m angry and I need some space… but I want you to know: we’re okay.” Then after you’ve had some time to think, give her a hug. Do something thoughtful to show her you still care (post a sticky note on her mirror where she’ll see it; give her that sideways smile that the two of you know means the argument is over; apologize for being grumpy…).