The first is to not have contact with that person ever again. You're moving forward with your life and it's impossible to see where you're going if you're walking backward, staring at your past. You don't need that other person for closure. You don't need one last conversation, you don't need one last hug, you don't need to see them one more time. What you need to do is focus on YOU. 

The second is to not lose yourself. Do something for you. Spend time with friends and loved ones. Pick up a new hobby or rekindle an old passion. Go out and enjoy life. You'll quickly realize being alone and feeling lonely are two different things entirely. 

There's nothing wrong with being single. You're still a whole person. There's also nothing wrong with casually dating - if that's something you're comfortable with (sex doesn't have to be part of it either) - so you can remind yourself there are a lot of great people out there. There's nothing wrong with making changes - cutting your hair, buying a new wardrobe, going back to school, changing jobs, meeting new people, trying a new type of food. The world is so full of wonder and experiences. Each day is a gift and you deserve every second of happiness you can get. You deserve to be joyous and laugh and dance by yourself in the rain. You are also allowed to cry and be sad and beat the crap out of a pillow!

If you need to talk about it talk about it. If you don't, then don't. If you're feeling like you can't get out of bed in the mornings, you haven't taken care of your hygiene in a while, you're neglecting eating, or pulling away from friends/family PLEASE talk to someone. Grief counselors aren't just there for when people pass away.

You are amazing. Everyone has bad times. Your feelings are valid. Focus on the positive in life. Remove anything that brings you down - we experience enough sadness without inviting it through an open door. Don't seek out things that will make you sad. Ask friends for advice. Watch the sunset. Eat ice cream for dinner. Go for a run. Save money every day and TRAVEL. Be a "tourist" in your home town. Have dinner with your parents (or friends)! Throw a pizza party with your girlfriends complete with Netflix, PJs, and wine. 

And remember - if someone is stupid enough to walk out of your life or forget to cherish you, you are worth SO much more! You are the only you there is.