Unfortunately immigration often requires people to marry earlier than they would if they were in a local relationship.
There is 100% nothing wrong with you wanting commitment from him before upping your entire life and moving to another continent.
There is 100% nothing wrong with him wanting to test the waters a bit before committing to marriage. To see what life is like day-to-day for an extended period of time.
However, with immigration, his choice isn't an option...