Trust is a wonderful quality. It is very satisfying to have enough faith and confidence in a person or a company to take them at their word.
And most of the time, everyone involved in a verbal commitment really does mean to keep their word and to stick to it.
The problem is more one of fading memories. As time goes on there is a good likelihood that one or both parties committed to a verbal agreement simply forget the details of the mutual pact.
The act of insisting on a written agreement is not necessarily a lack of trust. It can often be an excellent “memory aid” in the event of confusion down the road.
No matter how simple or unimportant an arrangement might be, a written agreement can actually become a relationship builder, and not a friendship destroyer.
As I said, trust is a wonderful quality!
Don't let it ruin a good relationship forever.