My ex friend wants to come to the wedding but I plan on not inviting him.
Why are you not going to invite your (ex)friend to your wedding?
I want to leave him out and get back at him.
Try not to focus on your ex for your wedding. Your wedding is all about you and your fiancee. The fact that you are even thinking about your ex is just going to cause you stress.
It's my wedding, I can do what I want.
While it may be very difficult, just try to focus your thoughts on other things. Your ex and thoughts about your ex simply cause you stress.