Because that is the end of that route. The latest update was to Lisa's route.
I would think that Haley is just protecting the MC because if you remember way back when Lisa started seeing that fat guy. I think it was Sandra who said it that Lisa isn't a good girlfriend that she will be with him for a little while then when she gets bored she will just move on.
So Lisa isn't really good girlfriend material like Sandra or Adrianna are which is why Haley acts differently with Lisa. Lisa is better as a fuck buddy.
If Lisa is anything like her sister, Alana who intentionally calls you another guys name while you are fucking her. I wouldn't even want Lisa sleeping in my bed. Also when Lisa is out partying all night wonder how many other guys she is fucking?
Also that bedroom is their bedroom the MC and Haley's and Lisa is the intruder.
Also the MC was with Sandra before before Haley and the MC were actually a couple.
You didn't see the part where if Lisa dressed up nice Haley took them bowling and if Lisa dressed in Jeans and a T shirt Haley took them to a club? That was the pranking.
I'm not sure, if you were on the Lisa path, how you could actually miss it since it seems to be a linear story line at that point. Did Lisa move in with you?