Hum I think if i was in this situation I would look at this as a time for self love and growth and since your so empty feeling that would be were I would start.
I would work on some self love meditations and affirmations to better get over the emotional hurt from all the cheating you said he did and to empower myself with the knowledge that your better then that. Since you still feel empty and upset over it i believe that your not completely over it and as such not completely happy with yourself.
This site meditation is rather basic and simple and really great for just emotional stress in general so i would start there for meditation.
As for rituals or spells belive it or not a daily 'spell' could be affirmations to get your mind into a more positive and 'moving on' kinda attitude. The belief being that by promoting positive through reading the messages and saying them out-loud you are changing your outlook from grief and emotional hurt to moving past it and loving what has happened because its made you stronger, wiser and better.
I would google some good affirmations and find ones that
CALL to you, search for key words of things you wish to improve with yourself and place them around your house I know it sounds silly but place them all over the place on little index cards or sticky notes, in the bathroom on the mirror, on your bed room door, on light switches, the fridge. This may seem stupid but this simple act starts your mind into thinking in the right mind frame and helps you move on emotionally. Keep in mind that this is going to take a little time and some believe it only takes a month to see change, other say 40 days like in the bible and there are a whole list of random people says what worked for them. The main thing is keeping at it. Also I would take affirmation you like and recite it a few times each morning or before/during your meditation times.
example affirmations:
"Today I will let go of the past that I do not need and create the future I want."
"When you finally let go of the past, Something better comes along."
"I will feel my grief but not wallow in it."
"I can find happiness in any situation."
"All things are unfolding as they are supposed to."
"Separating is for the highest good of all concerned."