To be fair, that's not what a bromance is. A bromance is a term used to denote closeness between men, but with a definite "no homo" element to it. It's a pretty discredited term nowadays.

This is a slash pairing, and honestly, there's so many of them. I don't understand why people would have a problem with it - they're really close, they clearly love each other in one way or another, so what's the harm in interpreting it as romantic? Ship and let ship