So I have been trying to write a character that is oblivious to romantic advances because they mistake them for normal, platonic reactions. I know how they act in my mind, but I can't convey it enough to readers. 
 A little background; The love interest is a stubborn nihilist. They don't *not* like romance, but they are just disinterested in it because they are focused more on their career. The reason behind their focus on their job is because they are about to be let go unless they can come up with a way to save it. The main character doesn't solve the love interest's problem, but helps them relax every now and then, making them more able to focus on their task.