I've been reading Lynn Johnston's "For Better Or For Worse" for as long as I can remember. It's the only comic strip I read daily. After reading thousands and thousands of FBOFW strips, this weekend was the first time I can honestly say that I didn't get it.

Here's the strip. Am I missing something? I don't understand why John is upset that April had a great day with him. He seemed to be enjoying himself in the boat. Will someone please explain this one to me...