What is the ruling on a husband who compares his wife to her ex-husband and accuses her of not loving him based on her previous relationship, and how can the wife deal with this situation?

A wife should not speak to her husband about her good relationship with her ex-husband. Similarly, it is not a sound behavior for the husband to reproach his wife for not showing him as much love as she showed her first husband.

The wife should show affection and love to her husband, treat him well, and be keen on using kind words and good deeds.