When people leave you, they leave because they think they’d be able to achieve or get something you would or could not provide for them. A sense of purpose, work-life balance, sex, kids, or some alone-time.
It’s not about you but them. I know it’s hard to let go sometimes but please, have some self-respect and accept the situation.
The funny thing is. They may actually go away and come back when they realize their error. But never beat yourself up when someone with whom you share a business, emotional or filial relationship leaves. It wasn’t about you.