Why does this happen with the iPhone?

So sometimes (rarely, but enough to make me question it) when my boyfriend texts me it comes from his iCloud email. I told him and he told me he also experienced that sometimes when I text him, saying it comes from my email. We don't know how or why. So why does this happen?

Added (1). we both have iPhones

When you send a message with an iPhone to another person with an iPhone, it can go either to their phone number or email address, assuming they set their phone to allow it. The message goes via Apple iMessage, not SMS. However, if the person sending or the person receiving can't send/receive an Apple iMessage, the text goes via regular SMS. On an iPhone, iMessages show up in blue color, SMS messages in green.

Those 'texts' are actually iMessages (instant message), & as such could use the Apple ID email address as well as a phone number.

Unfortunately Apple isn't very good as far as differentiating between using the phone number & email address (at least on the iOS devices) so it would show up under different threads.

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