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If you want to keep busy, it may be easier to do so once you get negative feelings out of your head. Get a pen and paper and jot down what you're feeling for a little bit each day. Then, once your feelings are out, you can focus your energy elsewhere.  Make a list of everything he did to disappoint you. For example, write things like, "He never held my hand in public" and "He didn't want to call me his girlfriend." Once you're done, set the list aside and try to focus your energy somewhere else. In the wake of a breakup, you may find yourself constantly thinking about what went wrong and why. It can be helpful to have new goals. This will help you stay busy and avoid thinking about him.  It is important to strike a balance between activity/distraction and rest/reflection. Thinking about it too much can result in depression, but running away from it can keep you from healing. Think about something you always wanted to do. For example, did you always want to take up running? Try developing a workout routine that will teach you to run. People often become obsessive over past lovers. Sometimes, the easiest way to beat one obsession is to replace it with another. Try to stay present instead of lingering over what happened in the past. At any given moment, keep your mind on what you're feeling and experiencing right now.  Try to enjoy the small day to day things. Even something as simple as eating a great lunch should be savored. If you find yourself thinking about your ex, stop and think something like, "That was then. I'm going to focus on what I'm doing and how I'm feeling right now." You can use grounding techniques to get off the hamster wheel of thinking about him and bring you into the present. Look around and name five things you see. Five colors. Five textures. Close your eyes and identify what you hear or smell. Self care is important, especially after someone hurt you. Do not neglect the normal rituals of eating right, exercising, and caring for yourself overall.  Keep up with personal hygiene. Even if you feel like lingering in bed all day, get up, shower, and brush your teeth. Stay on track with your exercise routine as best as you can. If you're feeling really down, reduce your routine. For example, go for a brisk walk instead of a jog. Eat right. Binging on junk food may be tempting when you're feeling down, but it's unlikely to make you feel better.
Write out your feelings. Give yourself something to do. Keep your mind in the present. Take care of yourself.