How can one learn common sense?

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I do not always do things in a smart way, sometimes i can do irrational things or act impulsive. I have already completed two courses, political science and law, but still my boyfriend sometimes when we quarrel, he always points out the way I act, that it is irrational, most of time he points out that alot of things that are common for others to think about on, or common for other people to think or do, and i do not them or think common as them. I am still learning about of lots of things, and this "common sense" thing gets me..