This isn't going to be the happiest post you've ever seen, but hopefully it is informative.
Today I am going to talk about moving on. This can be applied to friendships, relationships and anything else where you have to keep walking forward and put the past in the past.
At first after whatever type of loss you have you are going to be sad and confused and unsure of what to do. I always just try to not to think about it too much because over-thinking can be a very bad thing. It isn't always easy to just stop thinking of someone or an event that was so monumental to you, but just try to not go places or do certain things that bring back those memories to trigger your sadness. However, don't let this event hold you back from doing what you want to do and living your life. You are strong and you deserve to not have the weight of this hanging over you like a storm cloud.
Give it time. Don't expect to feel better within a day, give it time, give yourself the time to reconnect with yourself and come to terms with what had happened. Talking about it to another friend, family member or whoever can be greatly beneficial. You don't want to keep these things inside of you because then you'll be like a bomb that you can't control and you'll never know when it's going to explode.
Find someone new. I'm not saying that one week after an awful breakup you should jump into a new relationship, but after you give it time you might want to. It doesn't have to be a boyfriend or girlfriend it could just be a new friend to hangout with and do new exciting things.
Lastly remember you don't need that person to be happy. There's so many amazing people in this world so don't let one person rule your life.