Very often a man's timeline for commitment takes longer than yours. Commitment brings a huge amount of responsibility for a masculine man who internally understands commitment as duty, honor and obligation.
He is going to take longer (most likely). The more eager, anxious, demanding, expectation filled you are—the more you are proving to him that you will very easily be controlling, nagging and emasculating once married—something men tell me weekly they are afraid of when it comes to marriage.
While you don't want your time wasted here by attaching and committing to him before he does, you also don't want to rush this—a baby takes 9 months, let him go through his commitment process.
Give men the space they need to be who they are— MEN.
You are always loved,