My dd is 6 and exH and I have been separated for her entire life. We've both moved on and have new spouses and children. He sees dd every two or three weeks and I never hear from him between contact to enquire as to her wellbeing, nor does he engage if I try and discuss health, school or extra-curricular activities for example.
I am happy for him to see her more, ask about her, phone her etc which he knows. I have two dsc and dd sees dh speaking to them several times per week, taking time off for school events (for her too, not just dsc) and travelling three times further than her dad does for contact and I think it's starting to click that her dad isn't all that interested 
She asks if he asks about her and asks to see her or speak to her and I don't want to hurt her feelings, but nor am I prepared to lie or big him up. His excuse is that dd can tell him things herself when he sees her but, at 6, theres no way she can remember what she's done over three weeks and as a result he knows little about her.
Aibu to think it's pretty crap to only be interested in her when she's with him?