Should I Do What My BF Wants Or What The BM Wants?

I've been dating this amazing guy for 6 months now. He's 3 years older than me and has a son. With that being said, his BM (baby mama) doesn't like me being around her son, but my BF wants me to bond with him. The BM always has her BF around and Cole (my boyfriend) doesn't mind, it just irritates him that she's a hypocrite. I love his son, and I want to be in his life.