I had a friend in college who I got very close to. I had been single for a while at that point. We hung out a lot out of class, and she even tried setting me up with one of her friends. We went on one date and she was a fucking psychopath. Well around the time of the end of our program I got back with my ex and when I went to go tell her because I was excited and happy, she text me back "Great, so now the guy I want is FUCKING TAKEN!" I haven't talked to her since.
I had no idea she was interested, and even when I had tried to make a move on her in the past she rejected me, so I took the hint. Also, SHE SET ME UP ON A DATE WITH HER CRAZY FRIEND.
Don't be fooled, there are plenty of "nice girls" out there too.