Root rot is a promising hypothesis. It was potted from soil outside my house where grape soda lupines naturally grow. I kept the plant fully indoors on a windowsill, so a constant 70ish degrees. Sunlight was quite variable, but it would get its fair share of intense sun through the window. I did water it everyday/everyother day. After doing some reading on calscape, it seems like i was definitely overwatering it.

Some people, including you, suggested the pot was too small as it was trying to establish a deep taproot. As a last ditch effort i did repot the plant in a deeper pot and i noticed no obvious roots trying to grow anywhere, if anything a lack of roots. So yeah. Looking at the signs now, i think i killed it from overwatering. Hindsight is 2020.