I slept with my sister’s husband

Today after months of an affair with my brother-in-law, I decided to end it for good I am in love with him, and it hurts so much to break it up

but the guilt, pain, and jealousy are tearing me to pieces, I know this relationship is bad he is using me for his own pleasure, and I know I need to move on and find myself a person that loves me truly and that is free to love me too.