Have Relationship Questions? Ask a Counselor for Answers ASAP
It is possible that he is getting cold feet and is confusing that with feeling distant (or "not the same about the relationship") ; those are separate issues.
A routine will always be something any couple may encounter with time (couples go trough stages like anything else in life) What helps is to always seek spontaneous things to do, break the routine once in a while (but settled couples) are also able to be comfortable with predictability which is found in long term relationships.
Perhaps couples premarital counseling will be beneficial if there is willingness on both ends to try it. This will also help you sort out priorities, feelings and see what each one plans and how you and he sees the relationship let's say in 2 years from now, 5, 7, etc.