My imessage on iPhone 5 keeps crashing?

So me and my friend was texting each other and had a little contest. Basically we had to type as many emoticons in one text to top the other. Well I copied and pasted too many. So now the imessage keeps crashing I've tried rebooting shutting off and deleting it from multitasking (the apps that appear when you double click the home button) but none of those work. How do I fix this?

Then turn off iMessage.

Try putting device into dfu mode.
Here's how:
1.Power off the device.
2.Press the power and home button together for 10 seconds.
3.Let go off ONLY the power button, and keep holding the home button.
4. The device screen will now be pitch black.
You will need to reboot it now.
5.Reboot/Restart it by holding the Power and Home Buttons together for a few seconds. The Device should be showing the apple logo and will be powering on like it normally does now. Hope I Helped!

I did all that my iMessage app still keeps crashing

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