I've been going through this almost exactly, I finally came to terms with my feelings towards my husbando about three months ago now and not much has changed but very recently I've started having strong feelings for another character.
Only I am far, far more protective of him than my husbando when it comes down to it. However, he's from a game that I've never even played only watched a Let's Play of with a friend so I feel like I don't have a right. And he's rather niche, I highly doubt any other person feels so strongly towards him and as silly as it may sound to some that makes me feel guilty as well, because I don't want to turn him into the third wheel.
His personality is the downright opposite of my husbandos, and so is the desires I feel towards them both in what I want and get from them.
It's very confusing overall.