I know it hurts to feel betrayed.
I hope you can move on with your life without his cheating and lying and using. I know it doesn't feel like it now, but you are finally free. Let her have him. He'll use her until she's used up and then cast her aside too.
Your memories of him will fade with time, and yes, it will get easier.
You're better off without him. Like my dad used to tell me: when you're alone, at least you know you're in good company.
