But the difference here is he doesn't think he has a second family, only OP thinks this.
He told OP he didn't want the unplanned baby, he had one year old twins. OP chose to proceed with the pregnancy.
He doesn't live with OP. He gives her no money, but in the working week, comes to hers where he gets free lodgings, laundry and sex, and spends every weekend with his twins, away from OP. He sees her every 5th weekend, because that's the only weekend the twins mum gets off from her job and can spend with her children. He pays maintenance for his twins. But has only contributed nappies and wipes a couple of times for OP's child. Nothing else. The child is already in bed when he comes to OP's for the night.
Because she is chooses to do the things he might expect a partner to do, she thinks by default he's her partner. He does nothing in return.
I think there is a large degree of if OP didn't do all this, she and the baby wouldn't see him at all, and I do believe deep down she knows this.
I think she's trying to force a situation that's never going to happen, because the only alternative is that she withdraws herself and all the things she does for him, and then she's got 3DC, all whom don't see their fathers, and she's doing everything to stop that from happening.