<human>: Can you condense the text into a few key points?

Now...I know that trust is very hard to gain back because it takes time and effort. Effort from both parties. 

*I want to know how many people has experience losing their trust in their partner, or their partner lost their trust in them, and it was successfully gained it back (where everything is happy and dandy again) or it ruined the relationship (resentment/break up and etc.).*

**My input thought about trust** (Sorry this will sound negative) is that once trust is lost, it'll never be gained back and the relationship just deteriorates because of the 1 crack in the relationship will further cause multiple cracks (like any glass material item). The idea/image of the "happy" relationship that two people hold has been tainted. Resentment would build from the person who lost their trust in their partner, and will have a hard time trusting people in the future. Then there will be a struggle for that individual to be able to regain trust in people again.
<bot>: How was trust lost and was it successfully gained back, or couldn't be gained back and resentment built up which lead to the downfall of the relationship?