I'm sorry that you are getting mixed signals from this guy. I can imagine how confusing that must be. Have you had a direct conversation with him about how confused you are, asking him to just lay out what he wants out of the relationship?
When starting a new relationship with someone with BPD, it's important that you start off knowing your own boundaries and being able to stick to those, feel confident in speaking up about things that bother you, and learn how to communicate with the pwBPD in a way that they can understand. Our workshop on
The Dos and Dont's of a BPD Relationship can help you get a better understanding of what that relationship looks like.
BPD Relationships often start out very quickly, as you've noted that you met his children in a short timeframe. We have a lesson about
How a BPD Relationship Evolves that may help you begin to see patterns in your own relationship.