If Statement Failing When Comparing Text Box Values On Userform

I am trying to compare to values that a user inputs in a user form. It's ok if they are not the same I just want the user to know it. I am only including the part where the if statement is failing:

VB:
If Me.VSLongQuant.Value <> Me.VSShortQuant.Value Then
MsgBox VerUnBal
If VerUnBal = vbNo Then
Exit Sub
End If
End If

I have VerUnBal as Long and defined as:

VB:
VerUnBal = MsgBox("The Long and Short option Qunatities are not equal." & Chr(13) & _
"Is this intended to be an unbalanced vertical spread?", vbYesNo, _
"Unbalanced Spread Alert")

I can provide more info as necessary. There are two problems 1) the message box is appearing whether the numbers are equal or not, and 2) clicking No in the message box does not cause the Sub to exit.