well heres my two cents for what its worth...If u made it clear to the first chick that there u would be nothing more then fuck buddies then its not ur fault if she got emotionally attached, U gave her fair warning..As for the other chick, if shes smokin hot and u got these feelings for her then go for it. How many other chance are u goin to get with her again? Just go with the flow see what happenes and dont worry about it , if u spend ur life worring about what your actions will do to other people u are goin to be missing alot....Im not saying that other people feelings dont matter because they do regardless and its always hard to hurt someone esp if u know that they care about u. But u have to live ur life ur way and for u because in 10 years u prolly wont even know wtf either of these chicks are doin but u will still be there to deal with urself