Not Inviting the A-hole Coworker?

So I've skimmed through the many "coworker invite" threads and can't find one that is similar to mine. So here we go...and please note, no official save the dates or invites have been sent yet.

I work in a small company; there's 4 of us not including the owner. The owner is like a second dad; he's invited. One woman has always been great with me, she's invited. The older guy I could either invite him or not without any bad feelings; so I'll invite him if I can. So that leaves one...

I used to be close (not outside-of-work-hang-out close) with one guy here closer to my age. Well, since I started dating and becoming serious with my fiance, that changed dramatically. It was like one day he just hated me and was out to get me fired. ALL last year this coworker literally freaked out over any work related issue he could, causing stress multiple times with my boss over me. It got to the point where at the end of last year I literally went to my boss and said I can't do this anymore, and my boss was pissed at him because he knows where the real issues are coming from. Not to mention I keep track of everything I do and have actually not done anything wrong. Long story [shorter], our boss round-tabled with all of us to "cut the crap" so to speak, and even privately told me he was thinking of firing this a-hole. BUT he never did, and so we've all continued to work together for the last month or so (since Christmas).

But sure enough, he's still being an a-hole to me, but now it's just passive aggressive, and in hypocritical ways. It couldn't be more obvious (without dragging on in this post) that he acts this way out of jealousy and previous (and/or current) feelings for me. Therefore I DO NOT WANT HIM AT MY WEDDING. And I bet a million dollars he doesn't want to even receive an invite.

How would you all handle this? Secret invites to everyone except him? I know it's rude but wouldn't it be obvious to him based on how he's acted to me, privately and in front of the other coworkers?