what do i do??

Okay my sister tried to hook me up with one of her friends back in October 2009 when we had a get together for her birthday, and she turned me down because i went to another school an she thought i was the kind of guy to cheat. But I'm not and it was the first time i was ever turned down so i went into this deep depression cause i had fell head over heels for this girl but i eventually got over her and started dating again in January an was doing good.

One day she wrote me out of the blue and said she liked me an was telling me she wanted to give it a shot. but i was already crushing on this other girl who liked another guy that had a girlfriend an i felt as though she would never get over him so i started dating the girl an we have been through so much in just 4 months and she tried to break up with me multiple times because people were telling her i was cheating, had sex with another female, and was planing to break up with her, when in fact i wasn't.

Now that I'm with this girl, the other girl finally let go of the other guy an came to me an said she like me an we have had a lot of deep conversations before so i am basically in love with two girls from the same school who don't like each other and don't know what to do. I love the girl I'm with but she has a lot of drama and is very insecure an whenever she hears stories about me she doesn't come to me to talk about it an get both sides of the stories, she's quick to break up, and with the other girl its like she still likes the other guy sometimes and i heard she likes another guy as well an i don't want to feel like a rebound or develop this feeling for them if that's how they are.

So what should i do?