You are exactly right about the major commitment issue. He cares for you and he is frightened by what he feels. His fear of commitment is stronger than his desire to be with you. Then when he sees you or thinks about you he wants to take that chance. Then he gets scared and backs off. This is very unfair to you!
So again you are right about feeling that he needs space and time. There is an exercise that you could try. Focus on him in a quiet place while you are relaxed. When you are thinking of him it could cause him to think of you. This could prompt him to get in touch with you. This exercise has been known to work if it is what both of you want.
Best wishes,
🙂