Long story short. I was dating (for about a month) a girl, we decide to end the "relationship" four week ago, in good terms, at least that's how she said she wanted to finish, but in reality that not true. For me its all good, not hard feelings, but she no longer greet me when we see each other in a class we shared Thursday night. She no longer look to me or anything, and talk with everyone except me (we are only 12-15 in the class, so it's hard not to talk to everyone). There is a guy that she now talk a lot, and this guy is kinda friend of me, so that a little frustrating.

Ok, so... My question is; is this some kind one oneitis? I don't think so because I don't have any problems in going out with other girls, and honestly, I don't have any problems if she decide to date him. My problem has to do with the fact that she is being hypocritical, saying that we ended up in good terms when in fact that not true. Should I say something to her? Or just let it go?

P.S: Sorry for my bad English.