I will concede to you that the messages indicate there are some real issues in this relationship.
The problem I have with all the conclusions about abuse and particularly domestic homicide is that this was a 3-4 month old relationship; they didn't live together or even spend that much time together it seems; we see no evidence of escalating abuse; and we see no "cycle"of abuse.
If those things were present then I'd agree that might be something relevant to consider in evaluating the case.
But I think it is just flat out wrong and even insulting to DV victims to jump to a conclusion that a few messages, with no context, clearly proves this was an abusive relationship and it makes intentional homicide more likely.
Domestic violence and abuse is a very complex dynamic - and when we talk about escalating abuse and a cycle of violence we're talking about a whole pattern of behaviors over a longer period of time - a period of tension building, leading to an incident of violence, followed by regret and remorseful promises of better behavior, leading a victim to believe the violence is behind them, only to lead to another cycle of the same pattern of abuse.
It is very very hard to maintain that kind of dynamic between abuser and victim if the victim is not isolated and always accessible to the abuser - if they don't live together or share resources or have any kind of dependency on each other that allows an abuser to maintain power and control of the victim.
The fact that Reeva was "walking on eggshells" and fearful of Oscar's reactions is definitely not a good sign, but without any context it's impossible to know whether that says more about Oscar or Reeva. And under the circumstances as they were, I just do not see the evidence that Oscar was engaging in the spectrum of behaviors we normally associate with abusers.
There's really no indicator that he was pathologically jealous or tried to control Reeva's social relationships or activities. He seemed to have no problem with her having lunch with her ex. Given that, It's really hard to see a pervasively and obsessively jealous boyfriend