I think you need to get very serious about whether you want in or out of the marriage and act accordingly. You are not doing yourself or your wife any favors. If you want to stay in the marriage, you and your wife need couples counseling.
Why self-sabotage concerning your marriage when you can make a firm decision (to leave) without self-sabotaging?
How old is your daughter?
How would anyone else benefit from posting her picture on a dating site?
If two people agree to meet up, it'll be clear if the person is meeting her or not.
It's good to see you back here. I am very sorry about the circumstances.

WC