What should I do about him? (talking to another girl) is he just going to hurt me? (Please read)?

I met this guy a couple weeks ago through friends and he added me on facebook and started talking to me and it was pretty obvious he liked me. At the time, I wasn't sure how I felt. He asked me to hang out with him one day and I did. Nothing really happened that night but after a little while i started feeling something, it just came out of nowhere and I wanted to talk to him and see him more. We hung out yesterday and all we did was drive around all night but it was fun, i thought, he told me he did too. We parked outside my apartment and sat there for like 2 hours just talking and we discussed whats going on (he likes me and I like him). Nothing happened but he was holding my hand and that's it. But there's another girl. And it's not just any girl, this girl HATES me (i used to go to high school with her). He met her like 3 days ago and apparently she's been talking bad about me to him and their friends (they met through friends). She likes him, she told him that she does and that he's confused. He said that he doesn't want to hurt either of us but he thinks if he chooses me over her that all his friends who are her friends will stop talking to him. That's ridiculous right? This is stressing me out and it hurts. What do I do? I'm trying not to rush him and be pushy but I can't wait for him. It's too hard on me, emotionally and physically. (I have a very bad stomach and this morning I threw up because thinking about the situation was stressing me out) ....