So you have read the script for Civil War? Yeah, yeah, it's after two years when he didn't bother to call her, when even in AoU he thought only about Peggy and his "love" with Sharon will begin ONLY after Peggy's funeral. And of all the girls on earth he have to pick the one, related to Peggy. Yeah, he'll never admit it out loud, but subconscious projection is obvious. These writers know what they're doing indeed.

Also I recall, that YOU considered Bruce not worthy of Natasha. So, when it comes to your favorite, you want for her the best. Double standarts are such double standarts. Comic-book fans don't care about logic or ethics. They just want MCU to blindly copy comics, no matter what.
I'm fan of first Iron Man and TWS, such a great films, can't help myself. Didn't care about comics, where all kinds of stupid stuff happen, like Red Skull in Steve's body, until they began to shove it in the MCU.