After seeing what is supposedly the OG MC's reaction....
I don't even feel pity... that trash deserved it if that is their personality XD
Although my guess is, it is another reincarnator, hence why the girl isn't close to him and looking for a decent guy, which she managed to spot in MC after he regained his memories.
But seriously... who gets mad at a man for saving the girl you like... the instant reaction should have been gratitude and regret for you being a dumbass and ignoring what is in front of you.