Making up stories of past and present hardship for sympathy does sound like my ex who was diagnosed with BPD. But not everyone diagnosed behaves the same, and there are several similar disorders in the cluster, plus comorbidities. The diagnoses are really just descriptive anyway. We don’t know enough about our minds to really understand.

Ultimately doesn’t matter. Sounds like you have reason to doubt this person. If you can’t or don’t want to disconnect then all you can do is watch their behavior and react accordingly. If they betray your trust it does really matter why they did it.

Good luck, my friend.