Is It normal that im ok?

Its been a week since i found out my wife cheated on me. she said it happened once and she felt like crap since and hasnt seen the other person or spoken to them since. I felt so many emotions, rage, hurt, depression, SHOCK, and so so much confusion. I have been fighting for us all week and fighting for us to work on things. I finally got her to agree on counseling and giving us a try....for some reason, after she agreed to work on us and do counseling, i changed my mind and now my mind is set on leaving!....when i decided to leave...i felt a huge relief and like a heavy load was lifted off of me...i know i love her and i was ready for our life....but im trying to be positive and it makes me think to myself....maybe i wasnt happy either......i am very confused still...im not sure if ill regret leaving but right now the thought of it makes me feel happy and puts my mind at peace so it must be the right choice right? either way this separation is hard and i know i have a long road ahead of me. I just need some words of encouragement and some understanding. its so weird and sad sleeping alone again...