Welcome to Gaia! ::

Okay, so first off, I'm bi. Just had to make that clear in case people got confused.
Well, I met this girl seven or eight months ago. For the sake of her privacy in the very unlikely case that she sees this, I'll refer to her as Julia. At the time she was dating my friend, who I'll refer to as Matt. When I first met her, we connected. I felt like I could tell her anything, even though we barely knew each other. She's been a great friend, and I really like her (as more than a friend). But, six months ago I started dating this guy (Liam) and we've been together happily since. But, two days ago I bumped into Julia and she told me she'd broken up with Matt a few weeks back. This made my heart lurch. Sure, I feel bad that the relationship didn't go well, but she didn't seem particularly upset about it, and I have feelings for her. So, now I'm stuck in a hard situation - who do I choose? I've been with Liam for a while, and I really care for him, but then there's Julia, who I have feelings for as well. And, to make matters worse, I don't know how Julia feels about me, and even if I do break up with Liam for her, she could turn me down. Please help me!