Hi NeverKnew, I read your words very carefully. The first thing that I noticed is that you said:
"I've grown very fond of who has been talking about marriage next year"
Fond is not love. Nor is it being in love. Nor does being in love always lead to marriage. Why discuss marriage when you haven't really discussed beliefs with eachother or expectations.
"I have a tough time listening and I find that I leave the conversations not believing what I'm hearing so therefore I can't seem to retain the details."
It sounds like you are infatuated with this person. If you are not paying attention to these conversations now and actively participating in them you are basing your foundation similar to the WTS- on the basis of lies and deception.
"I asked what fears he held in walking down an aisle with me"
Probably he can tell that you are not being truthful to him or even to yourself.
Many here have offered you good advice. You stated that you are thick skinned so I didn't want to beat around the bush.
Please think long and hard about what I have said to you. Sometimes the truth hurts. Don't fall into a romantic fantasy. It's not real life.
I wish whatever path you take that it will be a happy and fulfilling one.