Sorry to say but this sounds very ridiculous, it clearly shows you are not yet ready to marry. Perhaps this should be a wakeup call for your would-be bride to make better decision

I guess you didn't understand what op means by anniversary. That means he is already married but wants to celebrate some years of their marriage and I think it is not totally wrong to postpone it to another time when he would be confident to spend money on it. He perhaps wants to wait longer to see the difference he would have from his hodling now and what it would turn out in the future.
However, my point to op is that he doesn't look serious to plan selling his coins at this time. He should have known the bull season is approaching so why buy coins and you plan to hodl it for the bull gain yet you are planning it for ceremony.