my ex

My ex-boyfriend called me yesterday, not knowing exactly how he gotten my new number, told me now he's has a new exciting life. Cool! I said. We catch up a little then he mention he is dating a girl who I had said was strange. Now it been about two years ago when I said this and  it was to someone else. I not sure if he's making this up or trying to make me jealous like he used to do in the past. I would've told  him what I thought of her but hey,  people change. However this girl loves to stare at a person for a very long time in a spooky way. And he's not kinda nutty himself. Should I tell him?