my boyfriends ex wife keeps insulting me on facebook!!!!!?

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The worst thing is i replied and made a fool outta myself! 
Shes 38 years old with a kid and she acts like a kid!
Im 20 and my Boyfriends 37, and this bit** stole my profile pic and uploaded it on her timeline and said "urgh so this is the ugly b****h thats replaced me, im offended! Bet shes a goldigging wh***".
All her friends left mean comments about me.

 I ended up replying saying shes an old hag and needs a facelift and she shouldnt be acting like a teenager because shes so old she has a saggy vagina!
 I said this in the heat of the moment but now I regret it because i look really mean and immature! 
Whats my boyfriend gonna think? Did she provoke me on purpose to get a reaction
SHE was the one who dumped him (thats what she said)

They DONT have a kid together.

There divorced and have been for some time, I never "stole" him.