My opponent?

If she says A, then of course he says B.
If he wants to undertake, she refuses firmly to participate.
If he decides to get up before dawn, she sleeps in and takes it easy.
If she sets the alarm clock to look at the stars, not even the fire alarm can wake him up.

Her gifts are never to his liking and his favorite cake she labels disappointing without even trying.
In his opinion holidays are pure madness, a waste of money and time, he rather go on a trip with his friends.
If she is enthusiastic about something, he cuts her off next calling her dull.
And if he decides to give up, she won't accelerate.

Not a single day passes by without envy, hatred, or fighting.
Their only agreement is just one can win the war.

It sounds like you are each other's opponents, I note.

The couple in front of me frowns and looks surprised.

What a ridiculous statement, they shout in unison, we are close, this relationship is real.

She is not my opponent, he adds.

He would be the last one, she said.

Okay, let's drink on that. Cheers, long live Yin and Yang the silver bridal couple!