We all are evolving and this all the time. Sometimes more, sometimes less, but we change. If you assume that we change by 1% per month, then after 70 months, or six years, we are a different person. The same happens to our partner. They too change and evolve and after about six years they are somebody else. We always have to check if we are still aligned in our partnership, because otherwise it may be that we drift apart in our development and after six years, there is a completely alien person sharing our life. Perhaps, you took it for too granted that there is a monolith in your life, where your emotions, good and bad, could be dropped and shared. But if that monolith is alive and changing as well, the emotions come back and fall on yourself.