You said you dumped her but from this little kinky text-sex, I can tell she had done the 'dumping' was before!
Well the guy can type better so I can't really hate him but seriously instead of going bodybuilder and getting another girly who might not also get the 'penetration' she is starving for, I'd suggest you build some brain muscle and get a smarter girl who would appreciate you a bit more appropriately or at least give you the proper 'good bye' instead of going around behind your back and acting like a drunk wannaba cyber he.

You sound like a young lad (under 25), I'd not worry about these type of stuff all that much until you are in your 30s. Women come and go, sometimes it is your fault and sometimes it is a blessing in disguise that she actually dumped you! My only advise, don't worry too much about breaking up with your woman until you got the carpal tunnel syndrome on your primary arm!

PS. I'd never seen the point in killing/hurting/beating your loved one and the person she/he was cheating on you with because if your lover has done such an act, that would pretty much mean you had already lost her/him emotionally(love, respect, etc.) so just move on....