Prayer for forgiveness from all & myself

I have done the worst thing in my life. I was unfaithful to my loving girlfriend of 4 1/2 years. I am a good heart and I simply made a mistake. I can’t take back this mistake, but I have told my girlfriend. She has forgiven me. I can’t seem to forgive myself. I am in fear of std’s because of pain I’ve felt.

However I have tested and everything is negative. I ask for a prayer from all you loving people. Please let me put away my guilt, work on being a better person, and have these thoughts and pain go away. Please forgive me. I pray for a chance to be who I really am again. Bless you all.