Well, in truth the "fairly honest" bit was half right. She did tell the OP she wanted to see other people "around the holidays". This is one of the classic signs that a person is not ready for a serious monogamous relationship. That's not necessarily a bad thing, as there are a lot of reasons to maintain a "friend with benefits" if you're not serious with anyone else. But if you're looking to be the only one, there's no point persisting after you hear this line because it just aint gonna happen.
Another interesting thing is that she just "happened" to meet her second husband right after the divorce from her first. That's a pretty remarkable coincidence, doncha think? Her first marriage falls apart and this guy just happens to ride in from the sunset and sweep her off her feet. Some might actually believe it, others might see it as yet another red flag. There's a good chance husband #2 had inside information on the situation with husband #1 if you catch my drift.
Meh, the OP dodged a bullet here. You're better off living alone than trying to make something work in that situation.