Not to messily project all over Jonathan Sims but...
Aro-spec Jon who's in a romantic relationship with Martin, but always feels weird saying "I love you," because yes he... loves Martin, in that he cares about him very deeply, but he's not sure if he loves him in a romantic way.
And he's nervously ranting about this to Martin while pacing, and says that he feels like he's lying to Martin by continuing in their relationship because he doesn't have the same feelings for Martin that Martin has for him, but he's not sure what romantic love even feels like, and he's not sure how he would know if he did love Martin, but isn't that something people definitely know? So...
And Martin interrupts Jon, grabs him to stop his pacing and asks him very seriously, "Does this relationship make you unhappy or uncomfortable?"
Jon stutters out, "N-no! I'm... very happy. More than I ever have been. You make me happy. Being in a relationship with you makes me happy. I-I just don't know if it's fair to -"
Martin interrupts him with a kiss, gentle and passionate. "If you're happy, then I'm happy. That's all that matters to me."
"O-oh." Jon allows himself to drown in Martin's warm hug.