<human>: Summarize the given text in a few sentences.

I've been talking to a guy I like [35m] for the past couple of weeks via email; my friends make fun of me because we don't text, but we prefer email. He generally emails me a quick question about school, and then the conversation turns social, and we'll send around 20 emails back and forth with huge stories and questions about each other, but I never know when to end the conversation. 

The emails aren't formal-- there's no "Hey, ---!" and "See you soon, ----" or any other salutations. So, I am having a really hard time figuring out when I should/shouldn't respond. I don't want to wear the conversation out and bother him, but I also don't want to just stop responding when he's still interested in the conversation.

So, how do I know when to stop responding to emails? What are some good signs the conversation is over?
<bot>: Instead of texting, I've been emailing the guy I like, but I cannot figure out when the conversation is over. What are good signs the conversation is ending naturally?