What happens if there is no communication in a relationship?

With no open communication, sooner or later your simple talks will become arguments because you no longer know each other then it becomes aggressive communication and sooner or later, it just becomes toxic and a burden. You cant expect a long-lasting relationship when you have no communication.

What is the reason of lack of communication in relationship?

Sometimes lack of communication in relationships comes down to not having enough empathy for the other person. Its so easy to get caught up in what we feel and need and worry about that we forget to take into account what our partner is feeling. Its not a character flaw – its just part of being human.