what should I do?, when she likes him, too? Options

[eternalyfe]

This is a long, complicated story, but I believe, to base your opinion on what should happen, the details count.

So there's this guy. He showed interest in me in early September. At the time, he was just a friend of a long time. I'll call him Alex. Now, my best friend, I'll call her Jessica, was the one who told me about this. Alex had told her and word leaked. Well, I was scared. I didn't really want to mess up the friendship that we have.
So I ignored him. And our friendship broke anyways. Then I paid attention to him more and became absolutely best friends. A couple circumstances brought us this far such as the fact that I thought that he was over me. So we talked all the time. On the phone for around 5-6 hours a week.
As time went by, I began to like him and realize that maybe he was worth the risk. I told Jessica and she was now worried that I'd mess up the friendship "triangle" that we three had created. Complicated, I know. But she says that if I'm willing to risk it, I should just go for it. Of course, after finding this out she would call me all of the time telling me things that he supposedly said. The first phone call from her came after we confessed our like for eachother. So Alex and I were in like. Jessica found out that he liked me back, (she originally thought that he was over me.) and, finding out that she was the "odd one out", called me. She claimed that he told her that he lied to me, etc. All kinds of lies to get me to give up and keep the friendships strong.
Well, other problems rose and the growing "liking" that me and Alex were going through went under the surface. Everyone thought that we never went anywhere. I never spoke a word out of line or leaked anything about the fact that I liked him. We were, in more obvious terms, a secret.
Then we declared ourselves officially dating. And we decided that it was time for people to find out. So I told Jessica. (Note that this was about a month and a half after I told her that I first liked him.) She was disappointed. I asked her why she was so sad about this. Her answers seemed to point me in the right direction. Finally, I asked her if she liked Alex. She said "not enough to do anything, but enough to make me upset that you two are together."
I told her that if she wasn't okay with it, I'd break things up. She disagreed and said that it would be unfair to me. Now, as I read through her new livejournal posts and myspace surveys, she's acting all miserable and claiming that she cried every night. I find it pathetic, just a bit, and I know, from knowing her for upwards of 6 years that it's all an act.

(So, if you made it this far...)
This is where you come in. What do I do about her?
Do I break things off with Alex, though he's the first thing that I've actually done for myself in a long time. Heck, I haven't even had a boyfriend in 3 years.
Do I stay with him and ignore Jessica's drama?

What's right?