“I’m not upset that you lied to me, I’m upset that from now on I can’t believe you.” Friedrich Nietzsche
When you are betrayed, it is the lit fuse on the stick of dynamite. An explosion that destroys the framework of the relationship, making everything else unstable because the support, the bedrock upon which things were constructed is now cracked and unstable.
A lie in and of itself is not necessarily a bad thing, but what led to it and the consequences of it almost always are because the impact is a hole blown right in the superstructure of the relationship, and the weakening of the supports upon which hopes and dreams were built. Because of the lie, because of that lit fuse and the explosive consequences thereof, everything you were building together collapses into rubble.