Relationship with partner

I’ve currently been with my partner 8months. I have two children from my previous relationship but I feel like my partner has an issue with my children or maybe doesnt like them. He doesn’t have any sort of bond, doesn’t speak to them much they are 4 and 7. He also has two children from his previous relationship and I can see a big difference on how he is with his own children compared to how he is with mine. We’re also engaged I just don’t know what to do anymore :confused: