I am pretty sure we have all been in a smilar situation like this or somethng close anyways. It hurts when you think your with someone and they used to spend a lot of their time with you then all of a sudden drop you off then end of the earth. If you haven't had that feeling before oh boy your in for a suprise because karma always catches up with you regardless if you want it to or not. No one deserves to go through that and I am sorry you are in that situation, but you need to be a man and tell both of them what you want, whether it be a relationship or just friends or just dating. I may only be 21 yrs old, but all of my past relationships have been like that, and i was always the one to get hurt. You can literally tear someones life apart by doing that kind of stuff, because your not being honest with yourself or the other people involved. I know most guys are like wow i wish i could have two girls, but what good does that do you even if they agree to it? eventually someone will get jealous and then it will cause problems. You need to think what you really want first. If its with sara or the other one. then sit them down and say look this is whats been going on, and this is what i want. Even doing that doesnt garantee you a sure win with either one of them. They may both get really ticked off at you, but one of em or both of em may understand, let them know so you can move on with your life and them on with theirs. Honesty hurts but its a lot better than lies. You never truly know how it feels unless you are in their situation. And thats the sad truth.