Yes, it's pretty predictable now I guess? Still hurts though.
The bottom line here is, can you trust him? Can you trust him with your feelings? Can you trust him to be around your child?
Why do you want to be near someone who insults you?
Do you ever actually see him drunk? You mention he is all happiness and kindness then the nasty texting begins. Does he ever say these hurtful things to your face?
(Regardless, his behaviour is far from "normal")