I'm going to act normal bordering on relieved and excited that my wife is leaving me
Why would you act like that in this situation?
I feel she will get over it soon and comeback anyways.
If your wife is not happy with you and you are relieved that she is going away, it's best to go through with divorce. Cutting your losses now will ultimately give you more time to repair the inevitable damage that divorce will bring.
Don't say anything to me about how I live my life. If it's not legal, I'll get my way either way.
If she is unhappy no amount of well wishing will bring her back. I think you need to face reality and try to understand why she is so upset.