Why does he still contact me even though I ignore him?

I broke up with my ex months ago and we worked on being friends and kinda more than that, but I met someone else and he kept trying to talk to me so I just ignored him and cut off contact and now my ex keeps texting me saying he wants to talk, and about being friends, I'm with someone else now so I've been totally ignoring him but he still sends me some. what would you do? why does he still text me even tho I'm ignoring him? what should I do?