Normally, it's incumbent on the person making a statement to prove it is correct, and not on another to disprove it - but as I have seen your other posts, here is my position - the two "rules" you set forth are incorrect.
- Red Skull simply says you must lose that which you love. He never says the thing you love most. As friends and fellow Avengers, there is no doubt love between them.
- Red Skull also says "a sacrifice", a soul for a soul. Your second rule creates additional restrictions that were not there in the movie. He does not state that you must sacrifice someone else. Personal, self-sacrifice for the greater good of a cause or others is also a sacrifice.
You can "love" many things. Losing one of many isn't a sacrifice, which Red Skull plainly states what is needed.
As Before I can agree that if you consider his family doesn't count, as they are already dead, I can agree of the love between the two, as it is clear that Romantic love isnt a requirement. I've said that in a post before.
But the sacrifice, is absolutely undeniably a requirement. Its giving up something. Not only does the Red Skull say that its required, but at the very end of Infinity War, Young Gamora hammers home the importance of the sacrifice when she asks Thanos about it.
The line Redskull uses in Infinity War is " To Ensure whoever possesses it understands it power, the stone demands a sacrifice"
That means Self Sacrifice wouldn't work. As the person who is willingly sacrificing themselves can't acquire the stone themselves. They're dead. By the exact words Red SKull used, the person who is doing the sacrificing would be the one who was deemed to understand its power. Not some other person sitting there watching everything going down.
While personally I dont agree with the "love" between them, I can agree that it COULD pass the test. The 2nd half absolutely and undeniably does not. Self Sacrifice just wouldn't work.
Barton did NOT want Natasha to die. He wouldn't have been deemed worthy to possess the stone. He would have been witness to a suicide.