For mature women only : How do I have this conversation ?

I know that my bf loves me but I just feel it's something he's not telling me. He would do anything for me but I have not met his family. I've met all of his friends. We've been dealing with each other for 4 years and actually official I'll say for one year. Well, the last girlfriend still comes around the family because they have kids together and they know her so they invite her. Yet, I'm here. He said he has no problem with me meeting his family at all and wants me to meet them. Talks of getting married and starting a family. But I feel he should let his family know what's up. They could still be cool with her on their separate time and still respect me as his girlfriend now. I'm not trying to make the fact I haven't met his parents an issue because I'm not in it for them, but I'd think if a guy was serious he'd want you to at least meet his mom. For my bday he said he wants to marry me and make me his but I said I can't believe that if I haven't met your family. That was a few days ago. We didn't finish talking because I had to leave and I didnt bring it back up but I just feel confused now that I'm here thinking about it. He assured me I'll meet his family but he doesn't really see the big deal. His mother and him don't get along so I wondered if that was the reason but it's been way too long and I feel he should make moves before I make moves out the door. I don't want to pressure him and I don't think our relationship is about his family but I do feel that meeting them is important if he's serious about me. I'm trying not to nag him or pressure him but its really becoming an issue because it makes me feel that he's unsure about the words that he says to me. I don't know if I'm over analyzing but I feel it's unfair to string me along if that is what he's doing.. I asked should I be concerned about his ex and he assured me that I don't have to be but how can I not if she's still coming around the family and I haven't met them yet. I just feel she shouldn't be still coming around anymore to family functions even if they have children. Especially if she knows he's in a relationship but even if she doesn't care that he's in a relationship, he should draw the line. I feel his family should know and respect me as his girlfriend and not invite her anymore. How do I have this conversation with him. He thinks he's doing everything that needs to be done but he isn't.

Ps. I'm not interested in hearing opinions about the situation. Just wondering how I can bring up my concerns with him and have a conversation to get to the bottom of things because I just feel so confused. And I'm wondering if I'm overreacting?