So I totally know how you feel. We were thinking she wasn't dating or doing anything else with anyone. Plus all her comments about how you're the only man she wants to be with.
Sounds like she is really confused!
I guess from now on you will have to treat her not like a wife but like a woman you are first dating, who may or may not be dating other people, since it is your first date and you are nowhere near deciding to be exclusive yet.
But still you need to decide if you even want to "date" her, knowing that she is possibly with other men.
Perhaps what she needs is for you to completely go dark and no longer be interested in going on a date next week or anything.
She needs to feel that she's lost you because of her behavior...when she almost had a second chance (next week's date), and SHE blew it.
