I just saw the episode. I guess she started the affair with RR even before her husband had been deployed. I thought the affair was later, after she had been alone for a while.
Sounds like this RR is a typical control freak, requiring her to send photos of where she was, who she was with.
I do not understand how women keep getting involved with these types of men. It never ends well. More than once, according to Bethany, he had physically abused her as well.
But LE found no signs that RR was the one on her FB page; his phone also shows that he did try to contact her after he had allegedly last seen her. He did not take part in the show, while Bethany's husband did. From what he says, she was having doubts about ever getting married or having the baby. He found out via text messages about RR, but she denied that it was an affair. When he spoke to her from his deployment, she told him she did not love him, not to call anymore, and he heard RR in the room with her while she was on the phone. This was all before the trip they ended up taking to Hawaii. He found out about the pregnancy during his leave but he said it did not really shock him that much.
He said she was getting messages from RR all during the final meal with her grandparents, and then she said she had to leave immediately. She said things would be bad if she did not go home (to RR, apparently.) He said he and she went their separate ways outside of the house.
Bethany's mom was asked to take a LD test, due to not reporting her missing for almost a month. But the family seems to be cleared. Her friend says that it was not unusual for her to not respond to messages.
All in all, LE seems to be no nearer to finding her or to making an arrest. It seems that they are looking at RR, but have nothing solid against him. I hope he does not get away with it forever, if he is guilty. Strange and sad case.