Ex question

So my bf and I have been dating for about 9 months. We're totally and completely in love and our relationship has been great despite some ups and downs. Which we've been able to overcome together. My bf has a son that's almost 2 years old. He gets to see him a couple days a week. I love his son and we all get along great. His ex-girlfriend is nice but has done some things I don't appreciate. She also wants to do more fun things with their son just the two of them. Is that weird? I mean I understand you want to have a good relationship for your child that's cool, but their not a family and why you want to confuse your child. Am I just being silly lol?