If you claim you were triggered by a show that was horror from start to finish I don't feel bad for you. You CHOSE to watch that horror show. If you hated Dean's death in the finale how did you handle Dean's gruesome, bloody, painful death in s3? Oh wait y'all started with s4.

You can't blame a TV show for triggering you. There was never guarantee of a happy ending, though the FAITHFUL watchers of the show -- the ones who watch for the platonic relationship between the brothers -- got a happy ending. SPN is literally a horror show. Not romance.
If you want romance, watch The Bachelorette, that seems safe enough for you. Stop looking for romance in content that was never meant to have it. Platonic relationships are very important to a lot of people. Not everything needs to have romance.
SPN was never for you if you hate that it didn't end with romance. Don't erase the importance of platonic relationships. Sam and Dean's relationship is one of the most important relationships on television today. Stop trying to ruin it.