Probably the father's attention
From her
surely from her
It's from Roxanne. That's why he suggested to ruin the dude so that her attention is focused on him.
Jeremy seems to be a bit obsessed with her, kind of like a brother complex maybe, so I personally assumed the scene referred to his insecurity that his sister's latest and only ever "toy" she's had will keep her busy, cutting into and lessening the time and attention she has spent on him thus far.
honestly i didn't expect for some brother complex to pop out, so i was like '??? no fucking way— surely it can't be'
seems entertaining lmao but iffy.
In CH4, is she saying that Jeremy(iirc) is scared that he'll lose attention from Father or from her?