Can I relationship from roommate to something else? If yes, then how do I do it?

Download the TrueStory.rpy mod and then follow the "Download and install instructions from EOLOstudios"

Uh sorry I couldn't find the instructions?!

If you go to the download links, the instructions are posted below it. But here:

Instruction for TrueStory.rpy:

PC/WIndows/Linux

Move/Paste the TrueStory.rpy into the 'game' folder, next to the .rpa files. 

MAC:

Mac: Right click the  MytimewithyouCh8.app -> Click "Show Package Contents" -> Move/Paste TrueStory.rpy into they "Contents/Resources/autorun/game" folder

Android:

file manager>android>data>com.adroid.mtwy>files>create 'game' folder if none then paste/move the TrueStory.rpy into it.