in the manga how many times did tadashi interrupted romantic moments?

There aren't really much...I guess about 3-4?

I can't tell آپ all the details (I might give spoilers), but I'll tell آپ this:

Most (or probably ALL) of the romantic moments that Tadashi interrupted are about the Kei and Hikari pairing.

But if آپ really want me to tell you, I'll give آپ a messege :)

many times

maybe 10 and above