Solar had recently passed from Ruin deleting his original dimension. You've just recently gotten over the fact Solar was dead. Your entire personality changed after he died though. You still weren't the same, no matter how much you recovered from the fact he's dead.

You, Lunar, Earth, and Monty were all chatting and Monty left for a moment. You heard a knock at the door, and opened it, assuming it was Monty...But it was Solar. Your eyes instantly widened. His design looked different.