Do I feel bad about poor NTR unknown boyfriend? No because I don't know him.
If the guy had at least a scene when it shows he's just a normal nice guy who doesn't deserve to be cheated on, yes I would feel bad... But the only thing we know is that girl number 2 has a boyfriend... And a picture... That's it...
Is girl number 2 a shameless slut for cheating unknown boyfriend instead of talking to him? This is a EROTIC MANGA shut up and enjoy the ONGOING story with a MC that's not a beta cuck.