Thank you!
You'll need to maintain different saves for a few of the different paths - it wouldn't be possible to combine them because they'll guide you to different scenes and, eventually, different endings.
For the scenes you're missing, you need to make a choice of either Abby or Chrissy (not both) at breakfast on day 3 after spending the night with them on day 2. You'll get a different event depending on who you pick.