Ron in deathly hallows..

I feel like everytime I post something or ask a question. I get massively down voted, but I’m going to take a risk cause I’very just been wondering about this but maybe this is a stupid question or obvious or something but..

I always wondered is Ron getting upset cause they’re around the horcrux or does he genuinely think there’s something going on between harry and hermione?

and if it’s not because of the horcrux, what makes him forgive them and come back? This whole thing and how they found the sword always confused me.