Try and keep the focus on you, Free.
If you were to meet some random (none 19 year old) dude right now, and he was extremely charming. Would you, right now, after all that's happened in the last few weeks, in the last few years, jump into a relationship with him?
For all that you think you know your husband, even you have to admit he's putting his best foot forward. As are you for that matter. I'm not saying you're both strangers to each other, but, yeah... I'm kind of saying that. Or at least, that might be a good way to look at it.
Worst case scenario he's playing you for a fool. Best case scenario you are two people who both need to go through a lot of recovery. Either scenario means there's a lot of figuring out to do. Always good to ere on the side of caution in these situations. A lot of caution. Tons and tons of caution. Go invest in some yellow tape and orange traffic cones.
And while you're at it, wrap some of that yellow tape around the 19 year old.