Silly talking......

I by no means want my ex back thanks no thanks check please.... I did however have some silly talking with my sister at dinner tonight. I said to my sister what I do not get is how my crazy and I do mean crazy ex boyfriend has hoovered over me in the past and I have blocked him ignored him the whole nine yards but yet he still found one way to get me back ( old e-mail) I forgot about and you would think he would buy a clue ( yes I blocked that e-mail) and now hopefully he is gone.... Anyways this is the part I do not get.... He is still living with the rich girl he left me for so this is where the silly talking came in... I said is she still with her for her money because obviously he doesn't care about her because hello he's still bothering me..... How does she not know he is texting his ex girlfriend and not be freaking out or is she a narc like him and not care? I am so over him but suddenly this silly talking came up at the dinner table today.