Huge PDA?!I dont know if I'd go as far as to say posting a picture of the two of you is a 'huge PDA' Lily... also forgetting their 5 year anniversary, yikes.
For posting a couple of photos and a 2 line caption?
What planet is she on.
Also I think it's fine not to celebrate your anniversaries so long as that's an agreement you and your partner have made, just forgetting is not cool.
Life was very hectic this year so my husband and I agreed to no cards or presents but we still said happy anniversary and we will do a belated meal out/night away at some point. I wouldn't be impressed if he just forgot altogether.