Why does he have to "think about it"?

Not all the time. some guys like to think so that they are doing the right thing ok.

You freaked him out, let me give you an example of this, my ex girlfriend told me that she loved me for the first time and I said that's nice thank you, and then she asked if I loved her, and I said I don't know. It's not a bad thing and yes you were right to tell him first, maybe he just doesn't realize it yet, I mean its only been two months so who knows.