Those statistics can be tricky, I'd be very cautious jumping to conclusions here. We would need to know the percentage of couples in the respective subgroups which actually get married to begin with. Gay males are notorious for hyperpromiscuity, so I can easily image that selection bias is at work. Specifically, that only the truly dedicated and stability-oriented gay couples actually get married while a higher share of straight or lesbian couples marry because of social conventions/expectations.
In that case, the underlying stability of all relationships (married or not) doesn't necessarily have to differ between gay, lesbian and straight couples, even if gay marriages show up with lower divorce rates in the statistics. Likewise, report rates for domestic abuse differing between women and men is not surprising and does not automatically mean that there actually is more violence in lesbian than in gay relationships.
is gay marriage a thing?, i thought it was a civic union since marriage was specifically or lawfully designated to male and female only.