https://www.cnet.com/news/avengers-endgame-sees-captain-america-making-the-coolest-possible-choice/

Now we know Steve survives the final battle with Thanos and his army, having held his own beside some vastly more powerful allies. Not bad for a guy who was once just a skinny kid from Brooklyn.

After this, he goes on a time-traveling mission to return the Infinity Stones to the right moments in the timeline. However, instead of coming back to the present after doing that, he decides to stay in 1945 and finally go on that date with Agent Peggy Carter -- a woman he fell in love with and lost when he went on ice at the end of 2011's Captain America: The First Avenger.