Hello guys! Just wanted to get some advices from here.

My bf(42m) and i(34f) been together over 3years and he has 2 kids with ex.

I met his kids first time for his birthday and we got along very well. They love me and i love them.

They told their mom that they met me and what we did and had good time with me.

But ex told to kids like "oh i'm happy that your dad seeing someone, they maybe marry next year and they gonna have a baby then they are not gonna love you anymore." and my bf heard this from the kids.

Yongest one seems like don't care she's like "Then i'll be a flower girl in wedding" "i want baby brother and baby sister!"

But first one is now 12years old and she seems affected by what their mom said.

She told my bf that she doesn't want brother or sister anymore.

I know we can't control what ex says but can you give me some advices if you went thru same situation?