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Don't force it. Do your normal daily activities. Don't ruminate. Don't judge yourself.
When you have a crush, it can feel world-ending if it's not reciprocated. If you feel like you can't tell if he likes you, he probably doesn't. If he says he'll call, and then doesn't for a long time, there is a good chance he's not interested. If he really likes you back, things should feel easy. Sometimes when we have a crush, all we want to do is obsess about them. But part of what makes you crush-worthy is living the life you're living, not obsessing about something that might never happen. Obsessing will certainly not make it happen. If you normally go out with friends or do yoga or anything else regularly, keep doing it. Thinking in endless cycles the same thoughts over and over about a guy who may or may not call you won't in the end make him call you. If you find yourself in this thought cycle, gently bring yourself back to the present moment. Focus on your breath and how you feel. Avoiding rumination can help the crush not seem so painful, because rumination tends to reinforce the negative feelings you are already feeling. You will feel a lot about a crush, and judging your feelings (feeling guilty about obsessing, or feeling ashamed that you still like them after they haven't called you) won't help. It's easy to get stuck in our heads with our feelings and it can feel insurmountable.  Remind yourself that you are awesome with or without this crush in your life.  Tell yourself that your feelings are valid, but also that they might not be representative of reality.