My iMessage keeps kicking me off after my cousin and I were sending each other really long messages

Hello Jamesw396,

Thanks for using Apple Support Communities.

For more information on this, take a look at:

iOS: Troubleshooting Messages

http://support.apple.com/kb/ts2755

To resolve issues with sending and receiving iMessages, follow these steps first

1. Check iMessage system status for current service issues.
2. Go to Settings > Messages > Send & Receive and make sure that you have registered iMessage with your phone number or Apple ID and that you have selected iMessage for use. Learn more about troubleshooting iMessage registration if the phone number or Apple ID isn't available for use.
3. Open Safari and navigate to www.apple.com to verify data connectivity. Learn more about troubleshootingcellular data or a Wi-Fi connection if a data connection isn't available.
4. iMessage over cellular data might not be available while on a call. Only 3G and faster GSM networks support simultaneous data and voice calls. Learn more about which network your phone supports. Go to Settings > Wi-Fi and turn Wi-Fi on to use iMessage while on a call if your network doesn't support simultaneous data and voice calls.
5. Restart your device.
6. Tap Settings > General > Reset > Reset Network Settings on your iPhone.

Have a nice day,

Mario