Break-ups are always difficult. Ending an important relationship activates the same parts of the brain as physical pain, which means that breaking-up with someone you really care about actually hurts. Everyone has to go through it, and there are healthy and unhealthy ways to deal with the pain of trying to move on. If your ex-boyfriend is taking the latter route by trying to punish or hurt you, the best thing you can do is focus on your health and well-being.