This question requires a quick thought. In my opinion, most people are who they are; meaning people don’t really change that much over time. My thought is we don’t change because very few people put forth effort to make lasting, life-altering changes. But let me ask you a 3-part question:
Should we change our behavior in order to be a better person to those we love? Or are we the person we are and they must learn to live with us? And if you choose the latter, how fair is that to those on the other end of the relationship?