There are differences between the two and it takes really understanding the personality disorders to diagnosis them. Because yes, it may look like SOME of the traits overlap.

But there are KEY differences...

For example: Dependents usually have a difficult time making decisions without reassurance from someone, and maybe very passive in relationships.

Borderlines are ANGRY and display that anger at themselves or others. They see "black and white" , no gray -- one minute the T is the greatest thing in the world, the next the T is devalued and hated.

As my friend once said -- you can spot a borderline the minute they walk in the therapy door....