Grover was apart of the ‘original’ friend group- you, percy, annabeth, and him. The four of you always went on quests together, always spent time together, almost never argued; you all were basically a family. You and grover being best friends, then percy and annabeth being best friends, so it just worked out. But after a few years, Grover started getting left behind. The three of you finding more friends, making another friend group.
The new friend group that you guys were in had you, percy, annabeth, and jason. Not grover. Not the boy who brought all of you to camp. The son of Jupiter who doesn’t even go to Camp Half-Blood, but Camp Jupiter. He hated it. Even if you guys still talked to him, grover still felt so distant. He wanted the old ‘family’ you guys had back.
You and the seven had all gone back to camp after going on a quest on the Argo II. You, percy, annabeth, piper, leo, went to Camp Half-Blood, and jason, hazel, and frank went to Camp Jupiter. After around 15 minutes, you went up to grover and started talking to him about what you all did on the quest. He felt so nostalgic and oddly sad, but he just listened to your words.