Generally, a high frequency of blinking is supposed to indicate a very intense attention span. In other words, your boyfriend is really listening. Whether he agrees with you or not is a different story. This depends on all the other signals he sends.
This blinking to indicate attention is one body language element in communication, but you must remember that blinking is also one of the physical devices the body uses to keep itself in shape. The tissue of the eyeball is unprotected, and it can get very uncomfortable if it dries out or if dust falls on it. For this reason, our lids act as washer-wipers and lubricate the eyeballs with tears during the blink.
Those people whose eyes tend to dry out easily or whose ducts don’t secrete enough tears will blink more often than others, so there are two possible reasons why your boyfriend blinks. If it occurs only when he’s listening to you, he’s really listening.
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