Help! She’s leaving me

Last night as we were shouting down for the night and Linda had showered and changed into her nighty, she told me that she would be going to Richard’s directly from today. Nothing new. She often did this on weekends. But, I could tell there was something more.
We were in bed for a few minutes, I knew there was more, so I layed there facing her. Her back was to me.
Then the bomb dropped. “David. When I get back Sunday night, it will be for my things. Richard and I decided it’s best that I move in with him permanently.”
As you could guess, my heart sunk. I had a million questions. But, I patiently listened. She turned to face me.
She loved Richard. She and I have been pretty much living as roommates. We hadn’t had penetrative sex for over a year, at least. I was rarely allowed to see her nude. On the occasion that I was allowed to perform oral on her, it was to clean her after sex with Richard. Always dressed from the waist up.
Richard is well off financially. As if reading my mind, she said she didn’t need or want a divorce. I could keep the house, everything in it. Including the vehicles. Richard was buying her a vehicle. In his name though.
Richard and his wife don’t have a sex life. Something medical on her part. He told me this when Linda started seeing him seriously. She was aware and supportive of Linda moving in.
I’m not sure what the bedroom situation will be. Linda told me that wasn’t necessary for me to involve myself in.
When I got home from work today, most of clothes,personal items and suitcases were gone.
The cars were in the garage. I’m assuming he picked her up.
On the kitchen table was a short note that simply said,

“I know I’ve hurt you. For that, I’m sorry. I do love you but not in the ways I need to love a man fully.
I’ll get the rest of my things Monday. Please don’t call. Don’t tell the kids yet.
We’ll talk soon.
– Linda”