Wait for him to say it? Hrmmmm is that a good question. If you are comfortable with the idea of being in love with him and you feel that you are in love with him. Why, should you wait?
I suggest when you have that feeling come over you when your with him then tell him that you love him. Maybe he is too scared to say it to you. It could be a way to bridge the gap. On the other hand please don't forget it can create more of a gap. But I think your sitting there waiting and waiting for him when you feel love for him could damange your relationship more. You can start feeling paranoid in how he feels and if you two have a connection.
Say it and see how it goes!