"To nurture the relationship" means to take care of and develop a relationship by giving it attention, support, and care in order to help it grow stronger and flourish. Full definition
Hopefully, you have been in the habit of nurturing your relationship with your adult child, but simple measures aren't enough at this time. (thespruce.com)
It concentrates specifically on nurturing the relationship between dogs and their humans and teaches them to focus even in the presence of distractions, such as other dogs. (bayshoredogtraining.com)
No matter how long you have been with your partner, it is vital that you find your own little ways of nurturing your relationship so that your partner feels appreciated and loved. (marriage.com)