I had the chance to rewatch the first movie again and it just goes to show how far out of left field the Hulk/Widow romance came.
It really leaves you scratching your head when you have a scene where Hawkeye's wife acts like it is so obvious even Stevie Wonder could see Bruce and Widow are a thing. Except..what? It's not obvious at all, she says that without even really seeing them interact. If this was just the beginning of a potential romance I could understand, but they are quite literally planning on running away together before the movie is even over.