You are right. However, the case is not a call for moralizing. In my view, one woman was quite young, per her family, unattached, neither married, nor engaged. The other two, partners for three years, but, not engaged, no family unit, no kids. Close to 35, relationships either move towards nesting, or partners start thinking that maybe it is not destined to be forever.
In no way was it a love triangle; at best, it was a case for couples' counseling. The outcome - brutal killing of Mo because another woman wanted her off own way - is shocking, and should be discussed from the standpoint of some people absolutely lacking human conscience and morality.