I mean for people telling it's a NTR, not really, MC wasn't messing with Jean group and was gong solo. The thing is Jean abandoned elf girl to her death and chose to save only the healer girl, so MC helped a fellow adventurer and now Elf Girl decided to join him and leave Jean's party, since she can't trust them anymore. So it's Jean fault.
Also nice to see Jean reflected on his behavior and properly apologized. And I loved the cat fight between Elf Girl and Healer Girl, so funny LMAO.
Btw, seems like the guild members calling MC those nicknames are their way to show some fondness for him.
Also I love that MC is weak compared to other adventurer, but compensate that with his big proeficiency due to his dilligent training.