I get frustrated in relationships and hence are quick to call it quits. How can I learn to be more tolerant and forgiving?

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Same way you do any kind of self-development.

1. Start noticing when you are getting frustrated.
2. When you notice yourself getting frustrated, do your best to substitute the behaviors and thought patterns of frustration with the behaviors and thought patterns of self-awareness and responsibility.
3. Examine each event after it happens and think about different ways you could have acted rather than the way you did act.