Girl keeps ending text conversations?

Anonymous
So I've been texting this girl recently and it seems like almost every time I do she is hanging out with friends or something like that. She usually holds the conversation well but she responds about every 5-10 minutes, so not like immediately. Also after like an hour or two or texting she usually just stops replying. The first time this happened she texted me the next day saying she was sorry she didn't reply, she fell asleep. Now however she jsut doesn't reply and doesn't say anything else later. Does this mean she's not interested?
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Also is there anything I should do in this situation like stop texting for a while or text more or something else?
Girl keeps ending text conversations?
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