Why did he add "I think so" at the end?

Native speaker’s answer
Rebecca
He adds, "I think so" at the end because he's answering the kid's original question, "but he still loves her, right?" So after saying he wasn't going to explain the movie, he still answers the questions. This is meant to be humorous because he does the opposite of what he first says! Ex: I'm not gonna tell you where to go. Go right. Ex: I'm not gonna repeat myself. Your dinner is on the table.