They may come back or try to keep some sort of contact - even non-direct contact such as 'liking' your FB posts. This let's you know they're still 'out there' but without them messaging directly.
BPD's do fear being alone and it's the irony that their ability to drop partners almost instantly leads them into doing the very thing they fear. Having said that though, some may come back because their relationship with any 'new' person has failed. They can treat previous partners like a 'substitutes bench' - all people who are potentially still available if nothing better is on the horizon.
Not the way people should be treated but BPD doesn't allow for logical thinking and can make the sufferer very scheming and mercenary. The thought of 'My needs at the time always come first' is the first law of BPD.
I never knew if my exBPD was seeing others during our many breakups and it was always me who ended up chasing her and getting back together, despite me being the innocent one.
So they may indeed come back but always be aware it might just be to avoid being without anyone. Also remember BPD is a repeating illness and they can leave again.


