First thing that really bothers me is the timing of when he made that appointment. As you said, you guys were in a very emotional time (good way)in your relationship. That is the last thing that should of been on his mind. It is different if you had a huge fight and he did it out of spite/anger.....but to be at a blissful time.....that worries me. Whether he went or not, it not prove'able. But he had the intentions because he took the steps and set it up.
Secondly, is the advice you have recieved to proceed very cautiously. When I was dating my Ex. This "package" showed up in the mail. It was pictures and a response type letter from some international dating thing (or buy-a-bride set up). I was all over him about it. He said he did that before we even got together and she was just a late replier.
I believed it. Wanted to believe it. Could make it make sense in my head. We can justify away anything when our heart wants too.
Just please be careful - there are many of us on here that wished we would of trusted the symptoms enough early on when they were there.