beta
If i take this metaphorically without separating head, heart and dick individually. It seems to me like Victor has trouble accepting. He's a lonely, scared, insecure & often isn't truly sincere or honest about how he feels while at the same time he wishes and longs to be loved and accepted. Henry had his own struggles w his multiple interest, sex addiction etc etc. But did Viktor ever truly confessed his true feelings to Henry? Did he ever voice out his jealousy or displeasure? Not really.
This is all speculation but Viktor mistreating Heart could be an indication that he never really accepted Henry's heart/love because he couldn't trust his heart or feelings deep down because if the next time Henry found someone else interesting he would be thrown away & maybe he was scared of that.
They were leaning more towards FWB situation and not lovers imo. Because the way he was more obsessed with Dick and Head this season while mistreating heart makes it seem like he could accept his dick and his rationality which is Head but could never accept heart because he couldn't believe Henry lowkey.