No Proposal - Are my feelings reasonable?

I’m 21, and my partner is 22.

We’ve been together for three and a half years, and lived together for just over two and a half years.

We’re currently on a 6 week trip in Europe. Before we left every second person asked if they should be expecting to see a ring, or if they needed to buy a dress (for a wedding) for when we got back. Every time I told them no, no chance, he won’t propose. I knew that he wouldn’t, I knew there was no chance.. but I still hoped..

We’ve been to Paris, Rome, Venice, and had romantic moment after romantic moment. Every time I’ve had hope and wanted a special proposal. I wanted the magic and the thoughtfulness... That hasn’t happened. I’m feeling sad, and disappointed. I’m also trying to decide whether my feelings are reasonable or not..

We’re still young and well I don’t want to get married straight away.. I still have two years left at uni and I’m just starting my career.. But I like the idea of a long engagement.. He is working in his desired field and flourishing..

We have discussed marriage, and he doesn’t know whether he believes in it, I’ve told him that I would like to get married some day and that I would happily have a long engagement.. I don’t want to bring it up until we’re home in the new year, but I just want to know whether or not my feelings are reasonable?