How to get husband back who left me for our maid?

I'm 53, been married 30 years don't tell me to give up or leave him because I love him forever and we were so happy, he's my best friend.

He is a freelance music teacher and has written and performed songs about me. He always held my hand, always kissed me good night, always told me how lucky he was. Just to show you how much he was in love, he didn't go on vacation with his male friends ever when we were together and even when two years ago his friend Dave won a trip to Switzerland all expenses included for 4 people, he turned it down. I even begged him to go but he said he'd rather sit at home by my side.
He never wanted to be without me. He cried a little more than a year ago when I said I was going to visit my sister in Germany for two weeks. He called me every day, texted me good morning, afternoon, night, even 30 years later he couldn't get enough of me.

Now we had a maid for 6 months. She's not that much younger than me so it's not like it was that, she's 49. After she was with us a month, I found a photo of him and her together on his camera. I asked him about it, he didn't respond. Then he stopped communicating to me and left me for her. I don't know why.

They were together 5 months he's since got all his stuff and left. He won't tell why. I'm gutted. I love him forever and ever.

How do I get him back? She is not a good person either..