I don't have experience with this, but it will take a lot of time to move on from this. It's something that you've dreamed about for a really long time, and it's OK if that is a deciding factor in your relationship. It's also totally OK if not wanting to get married is a deciding factor in his. It sounds like you have made your choice, but I would suggest taking some time alone to really really think about this. Are those memories you are truly okay missing out on, or are they memories you're telling yourself are ok to miss out on because it hurts to think wanting marriage could lose you your bf?

It's an incredibly hard thing when nobody is in the wrong and you realize that you're just different. Don't make a decision you don't want for the sake of somebody else. If you're positive about not getting married, try to shift the mindset. Instead of "I wish I could have gone shopping for my wedding dress," think "I have a couple hundred/thousand dollars to spend on something else" Instead of "I don't get to share my love for my partner with others," think "I cherish what my partner and I have wherever we are".

Like I said, it's okay to take some time adjusting to this new change in your life. Just be sure that it is the right decision.