What's changed about me

I've realized since all this has happened with my CS and the both of us trying to work on rebuilding our relationship together was before he cheated on me, I held him to a very high standard of loyalty. That has all changed for me now. At the beginning I struggled with the feeling of me taking the higher road and holding myself to a high level telling myself I will be loyal. I just no longer feel that. I no longer want to do that to myself anymore. Am I wrong for feeling that way? maybe, maybe not. 
I feel if another person were to enter my life, will I do the same? Don't know, maybe I will, maybe I wont. I'd like to think I'd handle it different to how CS did, I don't want to find out. But the meaning of loyalty with my CS has certainly changed with me.