When the two of you met, the interest between the two of you pushed you to meeting more frequently.
The interest was at its optimum and your guy would call you up at all times just to check up on you.
In such a situation, it is obvious that you need to stop pushing and allow him some space.
He might be your man but if you keep pushing, you may be working towards losing him unconsciously.
Guys need time to realize that it is time to move towards that next step.
For example: the two of you met some time back and everything s going great and you would really like to move in with him.
These doubts in many circumstances are identified during the relationship.