What is the difference between I never talked to him and I never talk to him? What is the difference between I never listened to classical music and I never listen to classical music? Surely your grammar book covers the present simple tense and the past simple tense.

"I never trustED him" is past tense. Example: "Even though he had a driving license, I never trusted him to drive the car." "I never trust him'' is for the present. "After the tough accident I never trust him to drive the car." I hope this helps!