Our internet is just bundled with our cable bill, which is an autopay from our bank account, so who pays for what, really? Plus, for a while when she was holed up in the other bedroom, she was having computer problems, so she just switched to her IM on her iphone and there's no stopping that. I have my phone through work and she shares a family plan with her mom and sister.
If you're not going to protect yourself via a keylogger (and somehow I didn't think you would), then there's no way in hell you should be allowing joint family funds to be used to enable her online sexual flings.
Just tell her she needs to set up her own account, and pay for it with her OWN money, separate from the family's funds. Then block her IP address from the home network.
Who pays for her cellphone that she shares with her mom and sister?
In fact, as long as she is wayward, it wouldn't be a bad idea for the two of you to totally separate your finances anyway. If she wants to act like she's not married to you, then she should feel more what it would be like to not have your support.
