I wish to ask anyone who can, pray for me and pull down some strongholds for me at a time in which I can not. Three weeks ago I caught my boyfriend of three years cheating on me. I was very in love with him and he was my best friend. We have been through so much together. We planned to get married. We did everything together. Now I am left with pain I dont know how to cope with. Anger that I can not seem to get out. And sadness that creeps into my life and has taken hold of me. I chose to be alone most of the time, because I am not fun to be around anymore. The tears keep coming, the confusion is profound. I thought I had finally found my happy place in this miserable world. Now I am just left to the emptiness he has put in my heart. I cant even pray anymore. I need help, and I need to heal and I dont know how.

Destiny is right, forgiveness goes a long way to heal a broken heart.
Here is a Catholic prayer I am not sure who the author is but it may help you start praying again. We are all sinners and when someone you love hurts you deeply it is easy to blame him and the other woman and anyone else involved. You got to let it go. Start parying for them and you will heal.
PRAYER TO AMEND ONE'S WAYS
O Master, Lord Jesus Christ,
You patiently endured our sins,
and were hung upon the life giving wood.
You opened a way to paradise for the penitent thief
and crushed Death by Your death.
Now forgive the trespasses that we Your servants have committed,
unworthy sinners that we are.
We have sinned indeed
and transgressed Your law.
We are unworthy even to lift up our eyes to heaven,
for we have abandoned the path of Your holiness
and pursued the desires of our hearts.
But now we implore Your immense goodness.
Spare us, 0 Lord in the multitude of Your mercies;
save us for the sake of Your most Holy Name.
Our days were spent in vanity;
rest us from the hands of our enemy,
and forgive our sins.
Subdue in us the cravings of our flesh,
so that, after putting off the old self,
we may put on the new
and live for You,
our Lord and Benefactor;
and that, obeying Your commandments,
we may reach eternal repose
in the place where all the blessed abide;
for You are truly Joy and Delight to those who love You,
0 Christ our God.
We send up glory to You,
and to Your eternal Father,
and to Your all-holy, gracious,
and life-giving Spirit,
now and ever, and forever.

Amen.