Being open-minded and willing to try new things (legal, of course) can change your mindset. While doing so, you may find a new hoppy or overall interest that may consume your mind, bringing you pleasure and a sense of contentment.
THIS IS SO IMPORTANT.
In some cases, while being in a relationship, you may find that they are the ones always there for you. They may be your source of happiness, entertainment, and comfort. What are you supposed to do now that they are gone? The good news is, you can do about anything you want. You make your own decisions and there is no longer a second opinion that may be turning your ideas down. Enjoy yourself, go sky-diving if you're really that crazy; otherwise, go read a book you've been wanting to read or learn how to play a new instrument.
Find other sources of happiness that do not come from human beings. Learning how to be independent and enjoying yourself will benefit you later in relationships. You won't put such a heavy load on your significant other's shoulders, which may cause less arguments in the future. You will just be happier with yourself, and as you all know, you won't be happy with someone else if you're not happy with yourself.
So, do something crazy or new to get your mind off of all of the struggles you may be going through. Sometimes you just have to say YOLO and go for it!