You don't need to be sorry about anything and don't let any of this stop you from posting it, this whole thing is really my problem, it's something I just need to accept, it stings, but hey, what can yah do?
Well, if it makes you feel ANY better, Arle x Lagnus doesn't seem to be that big of a focus ever since SEGA took over. Then again, the ONLY canon couple as of SEGA's run seems to be Onion Pixy x Oniko/Onionette. What's more, I still support Arle x Sig. Like, I'm not opposed to it AT ALL. I mean, I also ship Arle x Lagnus and Amitie x Sig, but I also ship Arle x Sig, especially after all the art I've seen on that blog of yours.
As for the Shigaru blog, I admittedly did think of getting rid of it at first, but that was a very ''in the moment'' kind of thing. The truth is that this pairing is too big of a part of my Puyo fandom for me to just abandon it, regardless of how down I might feel about it right now.
I know I said I would rather stay away from Puyo shipping for a while, but the truth is that I would probably be better off trying to enjoy myself even with that revelation, instead of moping around and feeling sorry for myself, I just don't know what to do in regards to Arle x Sig, because I certainly know that I shouldn't hope for any offical media to deliver on that one.
Well, that's good. Just remember, you're free to ship whoever you want, regardless of canon. Besides, I'm sure you (hopefully) saw what I just said about the current status of Arle x Lagnus as of SEGA's run of the series.
On a more uplifting note, check this out :
https://www.fanfiction.net/s/12905537/1/In-the-Grasp-of-the-Doppelganger-NEW-Canon-Flavoured
See the notes at the end, that was a nice surprise, I did talk with kirbymanx about the backstory for Doppel, which lead to this and I really did have a big grin on my face when I want online and saw it.
Oh, yeah! I literally JUST finished reading that as I'm typing this now. Personally, I love this because it's more fitting than ever before considering the recent revelations (at least, to the West) regarding Doppelganger Arle's motivations in Yo~n, the fact that I posted said info around late March, and it's being spread around the fandom like wildfire, and it's just straight-up cute.