Ok, but imagine this...
(say this happens sometime after keith joins the group again)
Lance and Hunk are talking about love advice and feelings again, and at the end Hunk just goes “Man, it must be a lot, loving someone. Being in love.” And Keith just happens to be nearby and hears what Hunk says, and scoffs, “Aren’t they the same? Why does there have to be two different terms for the same thing?”
Lance then butts in and says “Uhhh no? They’re completely different and the difference matters.” Then this hopeless romantic gets all passionate and probably says something along the lines of: “Anyone can say they love something or someone, it’s a choice. But being in love isn’t something you can easily control. Sometimes you fall in love for the silliest and most random reasons and you can’t see beyond reason because, well, you’re in love. It’s senseless, it’s weird and you never know who it will be. Sometimes you don’t even realise you’ve fallen in love until you’ve reached the very bottom.” But even after his passionate little speech, and Hunk’s knowing look, Keith, this clueless, clueless boy, just shrugs and says he still doesn’t get why there has to be a difference between the two. But then Lance goes, “You never know mullet, it could be important one day ;)”
It isn’t until later after the team comes back from a tiring mission, that someone cracks a joke or does something to lighten the mood and Lance just laughs, head thrown back, brilliant blue eyes sparkling and smiles wide. Keith then kinda stops, stares and just goes “…oh.” Hunk, noticing his friend go still next to him, asks what’s wrong. And Keith, with the most fondest fucking look on his face (you know, that look), not once taking his eyes off Lance, says quietly, “I think I get it now. I think I get the difference.”