Why do pwBPD tend to abuse drugs? Is it as simple as them trying to ease their pain and get away from their inner turmoil?
My undiagnosed ex was one of these types of people. She would drink with the sole purpose of getting drunk, and it was easy for her since she was literally a lightweight. Not only that, she would smoke weed at any chance she got. I didn't even know she had been smoking throughout our relationship. Her ex best friend was the one to tell me she was always smoking.
It was a little weird too but she would get drunk and then ask me to have sex with her almost every time. She wanted me to take advantage of her while she was drunk and I was sober. It felt odd to me and made me feel a little guilty as well. Histrionic trait?
Alcohol and drug abuse is common with people trying to cope with their horrible feelings. I myself walked that road for a short period before realizing what I was doing. PwBPD are no different in that aspect. It is a coping mechanism. The same goes with sex for some people.
My ex was (is?) a high functioning alcoholic. Didn't usually get visibly drunk, but drank throughout the day. Always had a buzz going. Sex was her other addiction. I think it made her feel wanted, desired, valuable. Plus the endorphins didn't hurt.
The whole thing of her being drunk and you being sober may have been an attempt to recreate an earlier trauma. My ex always wanted me to cover her mouth with my hand, like I was keeping her from making noise.