It seems to me that we all lie to a lesser or greater degree, and really, I don’t see this as a major problem. Let him/her that does not lie cast the first stone. But what I do see as very damaging and destructive is when we are found out and we deny our lie. We lie about lying.
This is when we are going to be in real trouble I think.
So here is my new understanding proposal. That we are allowed to lie but if we are discovered, then the least we can do is acknowledge it by putting up our hand and apologise for the lie.
If we can do this in 3 minutes and not 3 days then I think a relationship has a chance of succeeding. If not then I think the relationship is bound to fail, eventually.