Maybe the resentment refers to the dead ML going with a partner that isn't the MC

elaborate, this sentence confuses me a bit. LOVER3 cheating or the idea of MC cheating?

I think they meant, the ML (henry) may have cheated (that’s their theory)

I interpreted the scene where 'head' tells the MC "do you still resent him?" (Or smth along those lines) As him asking the mc are you still mad at the dead lover for cheating, because after that the Mc is going on about how there was smth of their shared memories that he purposely tried to 'carve out'

This is all just my speculation from the dialogue

* 'the one truth I craved and tried so desperately to bury' is the correct line