i used to be a pretty angry kid. i was just angry at everything, my parents, my friends, myself, the world at large and after a while my parents put me in therapy to try and help me out. that worked pretty well but it was only when i started to run did i discover the best way to exert my anger. by the end of each run i felt way too tired to be angry and once that "fire" is lessened, i found it so much easier to think rationally about why exactly i was angry and address it instead of just blowing up.
now along with running, i have a boxing bag that's fun to just whale on for a while until i either calm down or tire myself out to the point where i don't have the energy to actually be mad anymore.
some other things i do is just pop my headphones in and blast some music or isolate myself until i trust myself not to blow up at anyone.
super happy for you and your partner, hope this helps anyone looking for tips!