And I forgot to mention this, but pup was spot on with him getting aggressive initially.
This is a CLASSIC tactic to avoid consequences.
"If I go IN the house calm and casual, SHE will be FURIOUS and BLAST me, but if I go in the house ALREADY angry, she' try to calm me down..."
This is a classic tactic people learn by the age of twelve.. I tried this with my parents when I was that young. Don't let him fool you with his macho crap. He crossed the line and you need to throw some SERIOUS consequences at him.
This is a negotiation and consequences are your leverage here. If you have none , you need to find some. Texting OWH is a start, but if I were you I would drive right over to the house WITH your two kids and have a chat with OW and her husband.
Your husband needs to SEE what happens when HE crosses the line... and him having to wash his own damn underwear is NOT a consequence.