A trusted companion is someone or something that you trust and rely on. It can be a person, an animal, or an object that gives you comfort, support, or protection. Full definition
The steering wheel is no longer just a part of the vehicle — it is now a part of your home and will act as your most trusted companion. (bakermotorcompany.com)
By trusting your companion completely with these expectations, they are going to normally trust you in return. (plusizedating.com)
The move will be less traumatic and adjustment to their new home easier if they have the security of one or more trusted companions. (gfpets.com)