Could it be he thinks he stepping up his game and showing you " extra love " showing you now attracted he is in you with the new PDA and sexual advances. He might be hoping that energy or attraction would be returned or at the very least acknowledged.
Unconscious competition with himself...or maybe not so unconscious.
So your feeling have shifted .......keeping the family intact because of responsibilities.....obligation dates or sex. He's having trouble excepting the fact you've changed and are moving on.
I start there layout the roommate plan.