This person;
Had an 'authoritarian childhood'.
Cowers when the other person argues. The instigator says 'of course' they aren't scared, but expresses utter contempt for somebody showing fear.
Does not engage in arguments and withdraws immediately. The instigator then continues the arguments over the course of days through other means.
Does not initiate contact after this has happened. The instigator does not leave space, apologise or in any way demonstrate regret or responsibility.
Is not keen on re-engaging but will 'talk' after the instigator of the conflict has contacted them. Their feelings regarding being treated in such a way are mocked.
Comes back after the instigator has decided the matter is finished but the instigator maintains that the person is immature, pathetic and it's their fault the argument had to go on for days because they wouldn't engage in a full on row.
The instigator then considers dumping them as punishment for not wanting to accept being shouted at/having a voice raised at them and treats an unwillingness to be trapped in a verbally and emotionally threatening situation as a sign the instigator is being abused because they aren't getting the release they desire from a 'row'.
That sounds like a person who has got into an abusive relationship, one that has a partner who acts in a familiar way to the authoritarian (Shouting? Angry? Dictatorial? No room for being wrong or questioned in any way? Having to hide until they were called back and still told it was their fault?) being reeled back in for more of the same. Every single time.