I'm wondering if anyone here has experienced this or if this is at all common to bpd.

Last year I took a cbt course. While attending the course I made two friends who both have bpd. We were friendly for months and then lost touch because I felt both of them were telling lies. One said her daughter had just been terribly injured in an accident. I met her daughter for the first time a week later and all these injuries and facial stitches were made up, she didn't have a mark on her. I didn't even bring it up, I didn't want to embarrass anyone.

I lost touch with the girls (on purpose because of various lies). I have since bumped into each of them separately. Both told me they had a relative who had just been diagnosed with terminal cancer. I caught -Both- of them out since by hearing from others who know 'the people with terminal cancer' that they are not at all sick.

I lost a parent to cancer and both these girls know this and know how heartbreaking it was. I know that some people with personality disorders will lie as part of the disorder but I'm so annoyed given the seriousness of the lie and extra insult of knowing I lost someone that way. 

It also seems pointless to lie to me as I'm not even a person in their lives anymore.

Are lies like this sometimes a part of bpd? Can anyone see why they would lie about this? 