I may be totally wrong...
You mentioned it would not even be OK with you to have a platonic friendship with a boy...

Because you would not be honest to him in not telling him about your desires.

I think it would be perfectly OK not to tell him.
Why?

Because that's simply none of his business. As long as your conduct towards him is OK, what's it got to do with him?

Dakota and marc hold very interesting and valuable views in their posts, respectively. I am in complete agreement with their takes.