Since you have been together for a long time, it means that your relationship has been very stable. In this case, of course you have to give a commemorative gift. It is the most important and meaningful to preserve the relationship between you forever.
A crystal music box is very good. Crystal is said to be solidified from the tears of lovers for thousands of years. It represents the purest and most impure love. Now you are in the nourishment of love. Do you also want to make your crystal love more pure and transparent? I feel like going to customize one. You can also photocopy the photo of you and your boyfriend on the top of the music box!
There is also a popular couple necklace that is good. Engrave your names on it and keep it forever.
Of course, there are many very special customized gifts, such as real dolls, love chocolates, etc., which are very suitable for boyfriends. And you made it for him, so it must be meaningful.