I had a similar experience. I got a friend request from an ex-gf, she sent me a message saying "i know we had a bad break up blah blah blah. Lets be adults and put the past behind us blah blah blah" So I thought to myself she has matured alright so I accepted her friend request. The next day SHE unfriended me... Thats right after SHE sent me the friend request SHE unfriended me. Looks like she is still a nutjob.