meaning

Anyways, the description you provide in your sentences doesn't really explain the title of your question. But let's see if this helps, I provide you with some optional words:

Those explain when you're doing something without knowing you are. As for the guy in your explanation, I would say he does it "innocently", he's doing things without knowing how these things make the girl crazily happy.

If you're talking about the girl that likes him like crazy without him knowing, it would be like secret love, or one-sided love.

If I got your question wrong, let me know, to make sure you get what you want to know.