David and Madison timeline began on the honeymoon. All the cues are there. The night they got back from their honeymoon they were together. If they check with their "spouses" I guarantee you will find that both were mia that night and subsequent nights.

I think/feel that Ikechi is intimidated at her success. I also think/feel there are cultural differences that are insurmountable as they are etched into the very fiber of who they both are and their heritage.