@Hogshead of real fire
The fact that it's so sad becomes really crucial in Guardians 2. Ego tries to indoctrinate Star-Lord into his "higher purpose," and then casually mentions killing the mother. But that's what turns Peter against him, because losing his mother was super traumatic for him. Gunn made sure to show us how traumatic it was because the trauma of it is what broke Ego's spell over Peter. It's basically the reason the Galaxy was saved. It's the difference between Peter and Ego. Ego was willing to justify killing her. Peter would never do that in a million years.