no, you are not being selfish. You tell her the truth about the work.

Why do you only see kids on the weekend? why can't it be 50/50 and they stay there when with you?

M 37
W 34

T 12
M 8
D 7
S 4

Need break 4/12/15
W no ring 7/7/15

Separate room 4/12/15
Separate living suggested 8/15
W moved out 11/1/15