Exact lines from Endgame to prove that Stony is canon
1. Steve rushing to Tony’s side as soon as the Benatar lands.
Steve looking a combination of jealous/sad/angry when Pepper hugs Tony since he doesn’t get to hug him.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2. While trying to find Thanos.
Tony proceeds to angrily rip off his arc reactor, in other words - his heart, and places it in Steve’s hand. After angrily asking Steve to put it on and find Thanos, Tony faints due to exhaustion, anger and pain.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3. Five years later when Steve visits Tony with Nat and Scott.
If you don’t see the pain in Steve’s eyes that although Tony is happy but he is not a part of it, I don’t know what to tell you.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4. When Tony returns to the Avengers HQ.
Steve is clearly more happier now and is genuinely smiling.
Then they proceed to shake their hands for almost 7 seconds. If you are telling me that just friends or work buddies shake their hands for that long is normal, I am not gonna believe you.
5. Steve and Tony just staring at each other during Steve’s speech before entering the quantum tunnel.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6. At the Stark tower during 2012 battle.
Also, the “Do you trust me?”, ”I do” exchange.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7. After Thanos attacks the Avengers HQ and Tony finds Cap.
8. Old Steve on bench.
So, instead of staying in the present and not moving on, which he clearly wouldn’t be able to after his love’s death; he goes to the past and stays there. To live his life with the only other person he has loved besides Tony. If you remember AoU, Steve tells Tony that the guy who wanted a family, etc. went under ice 70 years ago and this is a new person. But after Tony’s death, instead of being stuck without going nowhere and not moving on; Steve decides to follow his late love’s wishes and tries to live a life that his husband wanted him to live.