InfoPath Dev

Hello, I am trying to create fields based off of the multiple-selection list box I have. I have a Repeating field (ClientContactName) that populates a Multiple-Selection List Box. What I need is for the items that are checked in the MSLB, I need an additional field for the submitter to enter a username. Here's a screenshot of what I have: In this example, I'd like to have text fields that correspond with "Contact One" and "Contact Three" to enter information for them. I'm not partial to the way I accomplish this so if there is a way to do this without using the MLSB I'm certainly open to that. Thank you!

It is going to be hard to do this with a multi-select. They are bound to a repeating field & if you add an attribute to that field for your email address (for example), InfoPath won't include the attribute when creating a new node (i.e., when a new item is selected in the multi-select). Why not just use a repeating section with a dropdown for the contact name?

That is perfect, thank you Hilary! Also, even though this was my first post I've come across several of your solutions over the past few months so you've helped me quite a bit before! :)