So, putting together my mostly-DIY invitations made me a little brain dead. Hoping you ladies can tell me what you'd do in this situation, or if I just need to let this go and stop worrying about it.
We sent invites out last Wednesday. I (with some help from FI) had been working on them a few hours a night for like a week and a half, so my brain eventually became a little fried. Based on our list, we had exactly 100 invites that needed to be sent. I bought 100 outer envelope stamps and 100 RSVP envelope stamps (cool! they sell them in sheets of 20! how perfect, yay). So the stamping and stuffing proceeds.
A couple days before the invites are set to be mailed, FIs parents ask us to invite one of FFILs oldest friends (considered an uncle to my FI, but he now lives out of state so they aren't as close). We have the space, so we say sure. I add him to the list, assemble the invite, put it in with the rest of them, and know that I need to make sure to put a stamp on that one at the post office when I go to drop them off. Next day, invites are mailed, and I giddily leave the parking lot because ZOMG WE'RE GETTING MARRIED.
Cut to like 3 days later, and it randomly dawns on me that I didn't put a stamp on this late-added guest's RSVP envelope!! I mindlessly assembled it, sealed it, and stamped the outer at the USPS. I feel like such an asshole. Maybe this isn't a huge deal in the grand scheme of things and he seems like a nice enough person to assume it was just a mistake, but I feel so damn rude!
Would it be ridiculous to reach out to him (especially not being someone FI has seen or spoken to in a while, and someone I haven't even met) and apologize for the oversight, or should I just let this one go?