She will leave

No matter if you lived your life to make her happy
No matter if you gave her everything from you
No matter how hard you try to make her stay
If she wants to leave, she will

And she doesn't owe you a thing
Not an explanation
Not a goodbye
Not a thing

She's free to go
Because everything you gave away wasn't for her
It was for you
Because it made you feel good to make her happy

Or, at least, to know that you did everything you could, to make her happy.