Of course, the misunderstanding is... unsurprising if the situation somewhat resembles the following:
"I'm not really that upset. It's okay that you're leaving. I can handle it. I'm even happy with it, in a way. I think, ultimately, this will be better, for both of us. I'm not sure we really could have been happy together. You were right, we have been having problems. Yes, of course. I'm really glad we're going to continue to be friends.
"What's that? No, there is a speck of dust in my eye, honestly. It's nothing. I'm not upset. Don't worry. Yeah, okay. I'll call you tomorrow, I guess. I still love you too. Have a good night. No, sincerely, I mean it. I'll be fine. Go out - have a good night. We both need some time apart.
"Hmm? You're right. I'll call you on Sunday instead. Ok. I love you too babe."
"Really. I'm not upset." Swallows. Wipes eyes.
"Bye." Waves. Pained smirk.