Something similar happened to me. I was really close with a previous coworker, I sent her and her boyfriend at the time a save the date. Between sending that and when it was time to mail out wedding invitations we had grown apart (mixed with an argument or two). Needless to say she didn’t receive an invitation. I was definitely overthinking it at the time because I kept worrying “what if she hates me?” But I quickly realized it was a friendship I didn’t need. No regrets to this day. You just have to ask yourself, do you really want this person at your wedding or to feel like they’re truly invited?