Well, those men don’t exist, and you know that. So maybe you wish your partner could bring a little spice into interactions with you? It’s ok to ask for things, if specific things would be nice. Flowers? Massages? Dirty texts during the day? Surprise intimacy in slightly inappropriate situations? Those are just examples, only you know what you should ask for.
Sometimes it’s just a change in perspective. I found myself absolutely obsessed over a fictional man in a romantic webtoons recently (fairly embarrassing, I know) and I had to ponder why. I realized that I liked that he was being protective of his love interest. Then I thought about how my husband has been more protective recently - not in an aggressive way, because we have a newborn at home and he’s in more of a caring role for me and our daughter now. But when I realized, “oh he is still very protective and masculine, just in a new way” it clicked for me and my ever-renewing crush on him got another life.
It’s good that it’s fictional guys that give you an “oooh” feeling of longing for something more. I’d be more worried about your relationship if non-fictional people you actually interact with were inspiring feelings like that in you. If you shared that, I might be like, well it’s ok to look at other people and really reflect “am I in a relationship I’d enthusiastically enter into again tomorrow? Or would I be grateful for the opportunity to move on and try something else?” Because that’s an ok feeling to have. You don’t need to act on it, if you have it. And if you feel you have to act on it, that’s ok too. It’s kind of ridiculous that we judge romantic relationships to be failures unless one of us dies during it.
When my husband and I moved in together, we had a lot of overlap. We donated some of them, but for some books we disagreed about which was the best copy to keep, or both felt sentimentally attached to our own. Those we still have multiples of.