The movie did as much as it was going to do as an action movie to indicate that those two were a designated love match. I mean, mutual crushes, send off smooch in speeding car and tearful goodbyes...I'm pretty much convinced that is love. Comic book movie character love. And better depicted than, say, the 48-hour true love match between Thor and Jane. (Or Brutasha, uggh...)
That said, MCU Marvel didn't/doesn't play this up as much as fans do.
-In TFA, Steve awoke to his new time with the wistful, "I had a date."
-No reference to Steggy at all in the Avengers (deleted scene doesn't count).
-In TWS, Steve indulges in some nostaligia courtesy of the Smithsonian, is involved in a modern day platonic Steggy friendzoneship, and is apparently on the verge of moving forward.
-AoU does endulge Steggy a bit, but only as a way to show that Steve is still anchored to the past. And to show that his romantic life is very limited. And to shore up Brutasha and counter-point the family Barton.
(Now, if you want to add in Agent Carter, I might yield that as Marvel playing it up, but it also supports the obviousness of the love she felt for him, with the loss still relatively fresh.)
That's about it for MCU playing it up. The rest is on the fans. And the mischief making of Evans & Atwell.
Now, speaking as someone who ships them hard (Steggy, not Evans/Atwell), here's a fanfic-worthy notion that is actually on-topic: Wanda will use probability magic, possibly with an assist from Dr. Strange (in a surprise cameo) as a way to "park" Steve's consciousness after he is shot down at the end of Civil war. He'll be sent back to some event prior to the crashing of the Valkyrie -- or maybe that very event, where he will miraculously "choose" to flip a transponder switch or something or find a way to keep the Tesseract from leaving the plane, and be found and unfrozen in his own time. Hello multiverse!
Then, they'll find a way to retrieve his consciousness from that universe, after he's lived out his HEA in that alternate reality, just in time for IW1.
Excuse me while I go write down that awesome fanfic.