Here was Aiden Rockerfeller telling Adriana how much he loved her, but he didn't want her to either accept or reject his proposal. He wouldn't even allow her to say anything with regards to it. He knew he would get rejected if he were to insist on a response immediately.
Someone may deem it weird, as proposals go with responses, however, Aiden was different. All he needed was for Adriana to know how he feels, nothing more, nothing less. If he wants a response immediately, he wouldn't get what he wants, but something might change sometime in the future.
Right now, all Aiden could hope for is to have a chance. A chance to prove how he loves her, a chance for her to know that being with him is better than living alone. He wants to show her how beautiful they would look together as a couple, to make her notice that she's the only one who could make him happy.