A brief search indicates that this is an MRA* talking point where a figure is quoted without any context or nuance.

The CDC also stated that 43.8% of lesbian women reported experiencing physical violence, stalking, or rape by their partners. The study notes that, out of those 43.8%, two thirds (67.4%) reported exclusively female perpetrators. The other third reported at least one perpetrator being male, however the study made no distinction between victims who experienced violence from male perpetrators only and those who reported both male and female perpetrators. Similarly, 61.1% of bisexual women reported physical violence, stalking, or rape by their partners in the same study with 89.5% reporting at least one perpetrator being male. In contrast, 35% of heterosexual women reported having been victim of intimate partner violence, with 98.7% of them reporting male perpetrators exclusively.

https://en.wikipedia.org/wiki/Domestic_violence_in_same-sex_relationships

There are further Wikipedia pages discussing the reasons for which it's difficult to accurately asses domestic violence rates and why we shouldn't put too much weight on unreliable figures.

I personally can't bring myself to believe that anyone's gender or sexuality predisposes them to violence or emotional abuse. I assume that both the instances of abuse and the rate at which they're reported are subject to societal factors.

* With this I mean a brand of misogynists and not egalitarian people focused on men's issues. I apologize if this usage is incorrect/offensive.