What is trust? The weakness is not in the man or woman in the true sense, but in the level of evolution of the individual. Their consciousness. Judas betrayed Christ, Thomas doubted and Peter denied him x three. Vivekananda, who was in my view, so further down the road than many, still doubted his Master.
Trust in a relationship is necessary, and would go a long way. Still, we are all weak, and exposed to the right circumstances or wrong forces, if you like, it can be tested. Jesus survived the demons as did the Buddha, but it was taxing, by all accounts, and they were very advanced Souls.
My take is that love of God and detachment in a relationship, doing one's duty while surrendering the results to the Divine in a spirit of acceptance, is a better way forward. We are all weak and fall short of His glory.