How do I stop the group texting on my ZTE750 cell phone?

I don't know how it started group messaging. I find it violating my privacy & want it off my boost mobile phone.

Welcome to Android Central! If you were included in a group text, it can be annoying, because any time someone responds to that group text, you'll get it as well. If there isn't any option in your Messaging app to leave a group text conversation, you may have to send a message to everyone in that group to stop the conversation. They may have to start a new group text that doesn't include you, if they want to continue their discussion.