I think it is more respectful to give someone an explanation than to just disappear on them. Keep it short and don’t make any accusations or anything else that she might feel compelled to respond to in defense of herself. Just try to make a clean break and give some closure.
She keeps emailing me so I finally responded
“I know its pricky and juvenile for me to act this way but I don’t think we should talk anymore. I don’t know if you’ll respect that decision but its the one i’ve come to.”
By ‘act this way’ I mean ignoring her emails.
Fine. Now, DO NOT RESPOND TO HER e-mails, IMs, snail mails, phone calls, etc.
You have said you would not, so don’t.
If she phones you, politely say, “Please do not call again. Goodbye.” and hang up. (If you’ve got caller ID, simply refrain from picking up the phone when she calls and do not return any messages she leaves on your voice mail or answering machine.)
Any response by you to her will be perceived as an opening to continue the relationship (such as it was) and will give her a hope that it is cruel to extend.