I’m just going by his behavior. Why does he keep talking about what an upgrade she is? Why not just enjoy her? It’s pretty transparent. If he was truly over Pantsu, he wouldn’t feel a need to do that.
If I started dating a guy who kept posting on Twitter about what an upgrade I am from his last girl, I’d wonder if he’s using me to taunt her. Saying it once is 1 thing, but if we’ve been dating for a month or 2 and he’s still doing it, I’d wonder why he’s even still thinking about her and I’d feel like he’s not really over her.