Question about BPD symptoms present in romantic relationships when drinking.

Currently on lexapro and Wellbutrin, history of childhood neglect/abandonment trauma and stalking. 

I wanted to get some perspective from you all on what I’m going through currently. For context, when I am not in a romantic relationship, I feel very stable. I have no issues with friends, family, or work. I also don’t have any issues with self-esteem or self-harm when single. In fact, I feel very positively and happy with myself. But once I’m in a romantic relationship, a partner can say or do something (usually innocuous) that triggers such an intense response from me, I feel like a different person. It’s blinding and feels like a flight or fight response. In those moments I’m sure my partner is lying, doesn’t love me, and will leave. In those moments I feel extreme self-loathing, exhibit self-harming behaviors to punish myself (hitting myself), isolate, and generally behave very badly (screaming, saying mean things). These feelings can last anywhere from an hour or two, to 12 hours, but usually not longer than that. If it happens at night, by morning I’m usually not bothered by the initial trigger at all. Rather I just feel regretful about my behavior. Lately this has happened maybe once every couple of months.

This type of situation seems to highly correlate with me drinking 3 or more alcoholic drinks, and very rarely does anything like this occur when alcohol is not involved. Context wise, I’ve been on off/on binge drinker most of my adult life, and also have a long history of risking taking behaviors. 

Is drinking alcohol a key factor in having BDP episodes for anyone?