My iphone won't let me delete someone's messages without it freezing up?

There's a lot of messages with this person and i kinda want to get rid of them. Every time i try to delete them my phone freezes up and i have to restart it a few times to get it functioning again. Any ideas how to get rid of them? (i have an iphone 5 if that helps)

This happened to me and you can delete messages, but this could caus system overloard, meaning deleting some valuble stuff, Sorry, Troubleshoot it to apple!

That happens to but it was my fault I put like 517 please please please and crash

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