I get what you’re saying, but for those exact reasons they decided to have it addressed on the text in the show.
In 9x23, Metatron said to Cas:
and for what again? Oh, that’s right — to save Dean Winchester. That was your goal, right? I mean, you draped yourself in the flag of heaven, but ultimately, it was all about saving one human, right?
Which was textually stating that Cas loves Dean (I read it as kindred spirits, other read romantically or however they choose)
And In 10x07 Dean is saying to Cole:
The people who love me, they pulled me back from the edge
Is basically Dean admits he knows Cas loves him.
Now, I understand that if we compare this to our world, we can see what you’re saying.
But thing in supernaturalare always extaggerated, not only because it’s a tv show, but also becuase of the universe they are in, you know? thedilemas they are facing are much more violent and life endangering, not to mention can cause apocalypse or some awful crap, the need they are facing is usually to save the world or to save their lives, so I find it hard to compare. here, and in the brothers relationship. It’s complicated judging their world in the lenses of our world. so we need to adjust it a little.
Yes, their friendship wasn’t always good, not at all. for me, they started being friends in the end of s7, but mostly in purgatory. still, it isn’t perfect, and the crypt scene in s8 was horrible, but also, in the real world, you don’t have friends who literally under mind control to kill you. so it’s different.
I hope you got what I was trying to say, if not- my inbox is open.