Guys tell me??????(about a girl)?

Do you honestly care about certain girls that you may hurt on an emotional level. Let's just say you see this really hot girl that is apart of the renowned "b*tch squad". She is hot and a big time backstabber, liar, and tramp. But you some how got her to really like you. To the point she is serious about you. But you realize what type of girl she is, and you say to yourself,"Let me turn off all emotions because I know this chick is bad news. For all I know, she might turn me into the next victim. So I might as well screw her over before she gets to me first.I might as well try to bang her and lose her."... Would you feel bad if you did that to her, and she was really deeply upset. Say for instance she did the same thing to many other guys that you did to her. Would you give a d@mn about her "feelings". And would you look at every girl you meet with the same caution simply after running into a low down girl like that?