It gets better. My ex left me for another woman and it is pretty awful. She was a friend of mine, too. Honestly, I miss her more than him. We were married for 20 years, together for 25, and have 3 kids.
My divorce became final about 6 weeks ago, after 13-1/2 years of marriage. A few weeks before that, I found out my ex-husband not only has been having an affair, he has a 4-year-old daughter with the woman! I still feel so shocked and betrayed. I'm having a hard time getting over it. I'm so thankful the divorce is final and he is (almost) out of my life! (Just some paperwork to take care of.) Now if I could only stop thinking about how he betrayed me like that. I guess only time will help.