Denji has not had it easy finding love in Chainsaw Man. Every single girl only wants him for one thing: his heart. If Denji had the heart of a normal human being that wouldn’t be a problem, but the fact that his heart has been replaced with the Chainsaw Devil makes every relationship he tries to have infinitely more complicated.
Source:https://www.cbr.com/chainsaw-man-reze-and-denji/