He actually didn’t. He was doing some things online sort of thing, not anything in real life. Not excusing him, but he did not have any physical affairs per Kalani since he came to the US. And what he did do was in Samoa before they were a committed couple.
There’s nothing to look up. Nor is it your job to prove a stranger’s story (who is also a known liar and marriage cheat). This is not going to be her unquestioning hall pass for her disgusting cheating.