This is a situation that’s probably reasonable common...
My dd’s father left us when she was a small baby. Because she never really lived with him (not that she could remember) I think she was fine with the whole set up. But as she has got older this has changed. One issue is that her father is quite wealthy. We are not poor by any means but, for example, we live in a tiny house house ( this is London) while he has a very large, luxurious house. When she was little this didn’t matter but various things she has said recently (she is 12) show that she is struggling with this. It’s not like she is jealous - more that she appears slightly disturbed by the differences between the life led by him and his new family, and us. She doesn’t say “that’s not fair” and in fact claims to me to like our house better, but it’s clear that this is very much on her mind...