One of the most valuable things that I learned was that it was possible for only ONE spouse to significantly change the dynamics between the two of us.
This happens when we truly allow ourselves to invest enough of ourselves into the future of the relationship that we can accept carrying the load until our spouse slowly but surely begins to change too.
I think that might be a good example of unconditional love.
It has to start with someone. Someone brave enough to put themself aside for a brief time in order to reclaim the two of you.