You see how may texts you've send to individual Contacts in the Texting Hub.
At the top of your Texting Hub, there is a Monthly Counter that lets you know how many direct Texts were sent and received.
It will also tell you the cost, if any, incurred for Text Messages sent through the Texting Hub.
Messages sent through the Texting Hub are to individual Contacts. Broadcast Text Messages sent through Create and Send are not counted here.