Regardless of if this is his way of ‘dealing’ with the breakup (I highly doubt he’s in the least bit as upset as Ellie purely cause he hasn’t shown one bit of remorse for his actions if anything he’s worse) I think he’s really rubbing salt in the wounds after a 6 year relationship cheating the whole time and to not even have the decency to be discreet about his new girl is so nasty and boarder-line sociopathic behaviour. Ellie got a lucky escape.