Most guys who go through a BPD, if they have any sense about them, will realize after it that something was badly wrong, but not have the prerequisite knowledge, therefore they search things on google, dial in on BPD, and end up here through a quick google search.
When it comes to BPD, you either went through one or you will never, ever actually know what its like.
This isn't a case of "she just wasn't that into you bro"
This is a case of a girl who was OBSESSED with you suddenly snapping for no reason when you least expect it, and going psychotic in front of your eyes, its a hellish experience, cuts, screaming, self harm, suicidal ideation, threats, slander, police, then one day the switch resets and she comes after you again telling you she loves you.... And she believes it.
If you never went through it, shut the hell up because you are ignorant to the extreme and totally unqualified to comment.
And if you are a narcissist type like tic tac or bigneil, shut up because nobody wants to hear your retarded posturing and the rest of the bile you toxic *******s spew out of that hole you call a mouth