Have you tried the LOVE OF JESUS? I've heard a lot of good things about him. I mean, Him.
As others have said...time is the best healer, in the meantime involve yourself in other things as much as possible. Taking your mind off the hurt and trying to look outwards rather than internalising your feelings will help you lessen the pain. Good friends can be helpful, so if you have any you can confide in do so. I lost my first fiancé to Hodgkin’s Disease when I was twenty-four and thought my world had ended. My uncle told me that I would meet someone else in time, but I didn’t believe him and thought I would never find another love like him. Three years later he was proved right and I met Peter whom I fell in love with at first meeting and was married to for 37 years until his death eight years ago.
Love yourself, and understand that you are worth loving. The person who broke your heart either wouldn't see the real you OR wasn't the right person to see and love the real you.
Oh, and time...
I embrace my broken heart, listen to love songs, let myself grieve my relationship (or one that never was) and let the grief run its course.
Then some shiny new object might catch your eye for a distraction to make the time go quicker.
Oh yeah - and spend hours per day on this site to make the time go really fast!
Hearts are fragile things. I have recently become aware of the Japanese artform called Kintsugi. It's a technique used to repair broken pottery. Gold powder is mixed with a resin so that rather than trying to hide the broken place it is highlighted to make the object more beautiful. I like to think of my heart as having a number of these golden veins. i wear them as proudly as I wear my wrinkles and gray hair. All of them show that I've engaged with life and taken chances -- a fair number of which have just added to the golden veins in my heart (not literally). I suspect that when we stop trying so hard to heal and start being as gentle with ourselves as we would be if we had a broken limb, we might give ourselves time and space to add to our Kintsugi.
I love this beautiful passage from National Book Award winner, "Three Junes," by Julia Glass:
"Splinters in the heart, invisibly and erratically painful: this is how Fern has thought of her accumulating sorrows. Impossible to expel or withdraw; if you're lucky, they slip out on their own. But perhaps they are more like the seeds inside a brightly patterned gourd, beyond germination but essential to the wholeness of the gourd itself. Without breaking its durable, ossified skin, you cannot remove them; sometimes they will clatter abut and make themselves known. It's just the nature of things."
Time. Exercise. Meditation. Support groups. Counseling.
Take responsibility for your part, learn from it, and let the bad feelings go.
Let go of resentments and anger. Grudge-holding only hurts the person holding onto the grudge. You will emerge wiser.
I believe painful experiences are an annealing process, like strengthening steel with fire.
This is an opportunity to learn and grow.