Oh Lysis, don't be so hard on yourself! This guy isn't worth your time or emotions if he's willing to take advantage of you and if anything you're lucky you can see what kind of a person he truly is before you wasted any more time with him!
Repeat after me: I am NOT a whore. He took advantage of me when I was weak, but that doesn't make me a whore or an idiot.
Hon, this happens to even the smartest, most reserved women out there so don't feel as if you are dumb or in any way a whore. I can think of two good things that have already come out of this situation: 1.) You realized what kind of person he actually is and what he's truly capable of, and 2.) You have learned from what has happened so that it [hopefully] will never happen again! You're a smart girl so don't think any of this is a result of you being stupid in any way, alright?
Now, what you need to do is purge this guy from your life 100% no matter how hard this may be. I'm not saying get rid of him forever, but you really do need to absolve him from your routine in every possible way, even by deleting his phone numbers and Facebook off your contact lists. The less you see him, the easier all of this will become. Unfortunately it can seem damn near impossible to get over that initial hump of getting rid of someone entirely but once you do it and you've gotten back on your feet--and you WILL!--you will be so glad you did it, I promise =)
You're a smart, beautiful girl and you're worth so much more than any of this. Don't let something momentary like this put thoughts of actions with permanent consequences in your head, especially because things WILL get better for you.
Please keep us updated so we can know how you're doing and message me if you need anyone to talk to!