Dude's an editor for that angel mangaka. They probably want to contact her for publicity or something. I'm actually surprised a lot of people commenting think he's just some creep when the chapter spells out what he is.
You shouldn't, since he's
1) stalking someone online;
2) trying to approach a much younger woman he has NEVER met, without her consent, even using his professional contacts for it;
3) he is very obviously a man driven by sexual impulse, as shown by his desperation, his "pet name" for Marin and his ogling Amane's fake breasts.
Ps: why TF is Gojo apparently angry and repulsed by his GF glomping him and wanting to be together?