It depends on what you want. Most sensible people want a long lasting relationship. For those that don't, they will opt for instant gratification, and move too fast into a domestic situation, without really knowing who they have aligned their lives with.
Such foolish thinking, although made to look so easy & perfect on sitcoms, often ends in a very bad way because they never took the time to get to know the individual with their eyes fully open.
What I mean by eyes fully open; is that when you are intimately involved prior to really getting to know the other person, you set yourself up for disappointment when life starts testing the person or the relationship.
You will suddenly see a side of that person that you were never aware of because you were assessing them with emotional blinders resulting from premature intimacy in which you gave up too much too soon.
The high level of respect he should have for you will not be there because he didn't earn it; you simply gave everything to him because you didn't love & respect yourself enough to make him earn it the right way.
By moving in with him, you subtly say that you aren't confident that you can keep him otherwise. It is a move of desperation. However, if you really want to know his heart-if he is really all about you & not just himself; hold out. Insist on doing things the right way & he will show you who he really is, & what he's really about-whether it's you, or himself.