losing my mind

So I kinda need some advice.

Theres this guy I've known about in high school but we never dated. years down the road we find each other on a dating site and start talking. We've been dating 3 weeks and i really like him and reciprocates the same feelings. Ive met his family already and he's met my daughter. She adores him, always asks me to take her to see him and everything. When we started dating i found out he knows my guy cousin (no blood relation at all, just close family friends).. I also found out hes the father to my cousins half sisters son. So i feel a little wrong on being with him but we are happy together.

Its been 5 months since he was able to see or speak to his son because his baby mom is just petty and selfish. She found out hes dating someone new and that i have a child and now she wants to be back in the picture.

I feel on some level like she hates me or resents me because when they argue she throws me and my child into the mix and says how he should play daddy to my daughter since she needs a father. (biological dad left us)

He does what any rightful man would for his child.. Hes fighting to see his son amd have time with his son and she tells him no because she doesn't want to send him to NY to spend time with his dad and other family. She just keeps going on about bullshit though. Now you're right, ita not my place to say anything.. But me being protective and at least having my head on right, i feel like i should. i just dont want to cause more drama by giving her a piece of my mind.

Now when my BF was single she wouldn't let him have nothing to do with his son.. She blocked him off of everything and blocked his calls. Now we're together and she unblocks him and its wrong. She claims hes the one whos in and out of his sons like but shes the one who forces it when shes letting him be there part time.

I just dont know what to do. Part of me wants to hit her up and try to speak some sense into her damn head and the other part is telling me to stay away and juat drop everything.