Why on earth would OW have a smug look on her face?
Doesn't she know she is with a lying, cheating, POS? Oh, wait....
Yes it does get better. Time helps buy it's also what you do with that time. Do you think she won? Not from where I'm standing. What are you doing for you? What are you doing to stop letting either of them take up headspace?
I can't say it helps when it comes to watching your kids be either ignored or used in his bullshit 'good guy' act or with having OW around them. I can say it stings less as time goes on.
Anger is a cover emotion for hurt. I don't get angry much anymore except when it comes to my girls. I don't think I'll ever stop being hurt/angry for them.