Love is necessary. Chemistry is necessary.
But so is thought. Decision-making. Consequences for ‘falling out of love’ and breaking the physical contract.
The ability to ‘fall in love’ is instinctive and animal. The will and commitment to maintain that is human. The ability to overcome and work together to restore that which has faded or been broken is nothing more than human will.
How does saying, ‘there should be consequences for breaking the contract’ harm YOUR marriage at all?
It doesn't. Why on earth are you assuming it does?
We went into our marriage with a great deal of thought. We were together for over two years before marrying; we wanted to make sure we knew each other completely. Both of us knew we would be doing this once, and once only. Divorce has never been an option for us.
Falling in love didn't preclude any of that.
Falling in love is not animal. Tearing off your clothes at the first stirring of the libido is animal but falling in love is not. I’m shocked at your ignorance of either love or marriage.