<human>: Can you condense the text into a few key points?

My friend and I moved into a house 2 years ago.  Eventually, she moved-in her BF without saying anything.  He was over every weekend + every-other-weekday.  Never offered any $$$ for Rent or Utilities.  Most inconsiderate people ever.

When I moved out, she stayed to move him in more officially.  But since they can't afford the rent, they had to move another person in.  Sucks to be that third wheel:  I know first hand.  Our landlord made us sign a document that said we would settle the return of my 1/2 of security deposit between ourselves.  Should have been a red flag.

She sent me a list of things I owed (I didn't live in the house for the last month of the lease but I still paid full utilities).  Included was a $300 bill for mowing the backyard.  Coincidentally, she just so happened to have thrown a party after that work was done, 6 weeks after the lease ended.

I told her I'd allow $100 to mow the yard (tiny yard), and I should get at least $100 back.  Never heard back from her.

I'm getting off easy, though.  After she moved out of the house where she shared a bed with her ex for 6 months, she stuck him with $1500 in damages caused by her dogs.  Handed him a check but then went and canceled it the next day.  That should have been yet a bigger red flag.

Just really frustrated that she feels like I owe her anything after she moved in a dude for 6 months.
<bot>: The saying is true, kids.  Don't move in with friends.  Also my fault for ignoring that advice.