Probably already know the answer 😭😭

So my boyfriend and me have been together for 2 years. I have my own kid (4) and he has 2 (5,3) from previous relationships. Here comes the problem. He’s been bailing on us (me and my kid) for the last few weeks. My lo has only seen him for a few hours in the last week. Today he was visiting with his kids and took them for lunch and to the park. I told him I promised my lo that I would take him to do the same things. So my bf told me that he would leave the park soon so me and my lo could go. Basically he didn’t want me and my lo anywhere that him and his kids were. I haven’t met his kids yet due to his ex being well immature. I’m so pissed and upset and so is my kid. Do I have a right to be mad and upset?

More Info: she has had at least 2 or 3 different guys around her kids. She uses the kids to control him. If he says no then she won’t let him see the kids.