My ex has 0 friends, she is an introvert, she doesn't have a "supply" waiting. 

I see many people say a BPD ex will not come back if they have a supply or if they split you black indefinitely.

If an ex with BPD discarded you and essentially acted like you don't exist, yet has no one interested in them and finds it hard connecting to others (0 friends), is it likely they will hoover back to you? 

Together for 8 years, broken up no contact for 7 months.