Yeeeeah!!! I like that she seems a bit peeved at your happiness. Oh yeah! She wants you crushed and pining for her. Just keep being positive, happy and working on your life (even if you are falling apart inside... don't show it!).
Be friendly and continue to do exactly what you are doing. If you are cordial and being easy to get a long with it's unlikely she's peeved at you being there.
Don't bring up the divorce at all. If she wants it let her do all the work. You just keep enjoying life, work out (endorphins are a great high!!!), hang out with friends, stay happy and look great.
There is no arriving, ever. It is all a continual becoming.
