Alright! So now a couple of weeks later and my meddling eventually yielded some results. I know I was in the wrong for suddenly jumping in, but fortunately it worked out.
W and M are working things out, thank goodness. I don't know if it was really my push that did it, but something changed after I stirred the pot and it eventually led to communication about insecurities which became something positive.
Because of it, we are all much happier. In fact, me W, M, and my Fennec are all going on an outing together this weekend! Yay bonding!