Can he see who I'm texting and what is being said?

When I was dating my now ex, he decided to get me an iPhone as a gift. Since we have gone our separate ways, he pays the bill but I give him the money for my phone.
I know if he looked into it, he could see the numbers I'm texting, but can he see what is being said? We have Verizon.

No. He can't see the actual content of the messages. The only way for him to obtain that, even for his own account, would be through a court order. Even then, VZW only keeps about 5 days worth of messages on their servers. There's definitely no way he can see the message content through 'normal' means though--not even online through his account.

Check out the source link for additional confirmation if you'd like. (note the 'text messages website' they are referring to means if you actually go to vzw.com, log in to your account to send and receive text messages <who does that?!> --NOT actually to & from your phone. So if you're going to a computer & logging in to his VZW account and sending messages from there, yes he can see those! LOL!)