Truth needs to be told but the movie warped Dencels perception of Reze arc so hard. Remind you in canon manga their 'romance' was nothing but Denji being a dumbass who got honeytrapped nothing else. That's the reason Reze didn't give a shit about him anymore after that arc.
And look at pircel, look how happy she was biting his tongue off. Sorry but manga Reze was a sadist who didn't give a fuc.