Overview
If something is just not working in one of your newer relationships, you need to address it. Nip this problem in the bud before it starts to grow deeper roots that will be difficult to get rid of. Do not dwell on the motivations behind something this person said -- there is no time, and there is really no purpose. You need to focus more on moving forward together and just let go of past mistakes. It just doesn't matter in the grand scheme of things.
