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When you're ready to be happy again, it's a good idea to spend a little time focusing on yourself. Spoil yourself, take care of yourself, and focus on making the changes that you want to make in your life. This will help give you time and opportunity to learn something about yourself and become a better person. You'll always feel bitter if you are left thinking that your suffering had no purpose or that those once happy memories are now spoiled because of how things turned out. Help yourself to future happiness by finding meaning in the things that happened. Look for a lesson to be learned or a knowledge gained. See that your bad experiences are there to make your life better and embrace them for that. A great first step to living your new life is to try something new. This will help you feel the tangible difference between who you were then and who you are now. It will help you see your new strength. Do something you've always wanted to do. Do something adventurous. You can travel, take a new job, or anything else that you feel gives you new experiences. Eventually, you'll want to find yourself a new community. A new place to belong, a new group of friends, maybe even someone new to love if that is what you lost. These new people will also help you do new things and have new experiences to build happy memories of. You can meet new people by taking a class, joining a club, or even joining an online community. You might feel, even if you don't realize it, that if you enjoy yourself "too soon" or you find happiness "too soon", that it diminishes the worth of the thing you lost. But that isn't true. And it keeps you from being happy. Let yourself have a good time and don't feel bad about it. You do deserve to be happy. If you find that you're having trouble getting back to business as usual on your own, and that maybe your sadness might be out of control or unusual: seek help! Don't think that getting professional help means you're weak or broken. Just the same as how you'd see a doctor and take medicine when you have the flu, you should get professional help when your brain doesn't quite act right.
Focus on yourself for awhile. Find meaning in your experiences. Try new things. Meet new people. Let yourself have fun and be happy. Get help.