It's weird, since she found out who I'm dating, whenever I'm with my LTR and she's there, she tries to make comments about me (indirect comments) or try to act like a "mother", ie, "listen to your GF pete!".

Today I made a joke about my old pet, and she said "have you always been that nerd pete?", which pissed me off cause I’m not that kind of nerd anymore and she said to put me down in front of my girl.

One time it's ok, but she keeps throwing shit like that when I'm with my GF and it's annoying. Why is this?

I'm also afraid that if she keeps going like this, she's gonna end up commenting about me and her more explicitly, and I'm not gonna let that shit fly.