When Tot wrote Yugo saying "I'm not quite sure what I feel for Amalia is love," I think I can safely infer that he meant that as a show of Yugo's inexperience. It's something he's never felt before, he has never been in a romantic relationship, I figure a lot of people react like this on first crush.
However, since I just binged all four seasons of Wakfu in a row, and that means I can think back to some of Yugo's behavior on previous seasons quite easily. And there are two things I wanna point out:
First of all, there ARE some cases of people hitting on Yugo (I'm thinking about the kpop girl from The Voice Thief rn), to which Yugo reacts with embarrassment before continuing his job. My point here is that Yugo can recognize romantic attraction from others. He's confused about his own feelings, not the general concept.
Secondly, in the second gobbowl arc, when Maude and Kriss Krass recount their backstory, they mention kissing at some point. Everyone (including Amalia, who is about as old as Yugo is) reacts with a variation of "damn that's a hell of a romance you got here." Everyone, except Yugo, who reacts with "oh wow you two are best friends!" I don't think Yugo was particularly sheltered when it comes to romance, so that leads me to believe that Yugo thinks it is perfectly fine and normal to want to kiss your friends, regardless of romantic inclinations.
Both of these + the above "I'm not sure what I feel is love" leads me to believe Yugo's conception of romance is different from that of most people. What he considers to be "a romantic gesture" "romantic desires" maybe even "a romantic relationship" doesn't quite align with what he's always been taught, which would be quite confusing indeed. Whether it's a Yugo thing or an Eliatrope thing remains to be seen (I don't think we've ever heard of Eliatrope romance before, aside from like... Chibi and Mina in Islands of Wakfu, which is no longer canon) but either way it's here.
TL;DR: This bitch arospec, babey!