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Go to an arcade or a movie, go shopping, do anything that will get your mind off of things for a little while. Just make sure you don't go anywhere or do anything that will remind you of your ex. Distract yourself by focusing on and helping others. Studies show that the happiest people are ones who give the most to others. When you're depressed, anxious or stressed, there is a high degree of focus on the self. Focusing on other people literally shifts your thinking and your mood from victimhood to empowerment. Clear your head with physical activity. It has been proven that staying active and indulging in physical activity releases endorphins - the happy hormones. A strong body can lead to a strong mind.  Join a gym, running group, or intramural team. Take up a physical activity you've always wanted to try but never got around to doing, like spinning, rock climbing, or yoga. Try to go for walks in the evening or take your dog out. A little fresh air can go a long way when your brain is taxed and your heart is weary. Take advantage of the extra time and freedom you now have. Find out what you love doing besides your regular job. Plant trees, learn music or take a cooking class. Learning something new boosts your confidence and can be rejuvenating. Get away from your current environment, whether that means taking a day trip to the beach or going for a hike, or going to Europe or South America for a few weeks. You might not feel better immediately, but being in a different space will give you a different frame of mind. Research has shown that just being outside your home can improve your health, since environmental factors are reliably related to depression, anxiety, and anger. You might have had goals for yourselves as a couple; instead, now you can set your own goals for yourself and your life. Thinking about goals is a productive part of reconfiguring your life without that other person.  These goals might be in terms of your education, job, social or family life, or hobbies or activities. You can make a list, which will help give you direction and much-needed forward momentum in your life (and less time to dwell on the past!). See the end of the relationship not necessarily as an end, but as the chance for a fresh start for YOU. Get organized. Figure out what (and maybe who!) you want in life and go after it!
Distract yourself. Get active. Get a new hobby. Take a trip. Set your own goals.