Perhaps, at some point, you realize that there is something wrong - something dysfunctional.
You initially figured that arguments happen, gaps arise, and the next consequential thing to do is to reconcile and hold each other tighter.
That the prospect of a life without the other is too much to bear, so you're willing to get past the differences and the harsh words thrown at each other.
Because, you've been happy and you've seen how much more you can be with the other person, that you realize maybe that person is your soul mate and you're afraid of letting go.
Because you're afraid that the person may be "the one that got away" (ref: Katy Perry's song).
But, it dawns on you, if the cycle repeats itself, maybe it's time to think of yourself for once.
Instead of reconciling during/after arguments, what if, this one time, you build a wall instead?
Instead of looking forward to a reconciliation of embrace, of tears shed, of meaningful exchange of words, that this one time, you build a wall and walk away?
And as Ellie Goulding so beautifully sings it - "It will never be the same."