I want to believe that. [And part of him does, despite it all - wants to believe she isn't like Milady, wants to believe that Aramis isn't wrong to love her]
[...]
But because of all that - you must know why it is that I can't just look away blindly to it. [He doesn't WANT to mistrust her - and he certainly hates it when people judge others without knowing all the facts, like they judge him. But still.] You've done nothing to harm him here, I know that. He trusts you. I just don't want to be wrong.