Losing his Tony affects Steve more than he wants to admit
Very first time, that fear of losing him despite of not understanding why that thought made Steve shiver with heartbroken agony
look at his relieved smile
And then they fight, breaking each other in the process during CACW.
Next time we see Steve is like this, broken shell of a man with breakup beard
And then he loses him again, and cevans talks about how vulnerable and broken Steve Rogers felt when he lost Tony again
Steve's beard when they're still searching for Tony, as shown in Captain Marvel
and shaving it after Captain Marvel is sent to bring his Tony back to him
Steve throwing himself in Tony's personal space
Look at him
Steve loved Tony, his actions after their fight, Tony's disappearance left a massive hole in his chest.
Never forget, Steve never stayed on the planet after Tony's death, he left to the past honoring Tony's words, he couldn't bear to be in a universe where there was no Tony in it
Headcanon : Steve did go back in the past to universe where Tony exists in the past
Steve left to the past, because of Tony's words.
Steve to Sam, “No, I don't think I will.”
This sentence opens room for so much more.