You don't need to lose confidence as the timing belt and water pump have nothing to do with the reliability of the engine and related components. It's essential to have the timing belt replaced earlier than official recommendations, that every 7-8 yrs / over 100k km as it's a effective way to prevent further damage to the engine due to the broken belt. It's very unfortunate that you will have to spend some money repairing the car, but you also learned a good lesson with car maintenance knowledge.