I [19F] like the same guy [19M] as my friend [19F]

I have been friends with this girl since middle school and we go to the same college and hang out very often. I became close friends with the guy through a club I joined at college, and I ended up bringing the girl to one of the club events one time and introduced them to each other. That happened about 4 months ago.

About 2 months ago, the girl admitted to me that she has had a crush on the guy since the day I introduced them, despite not meeting him in person since then (They do snapchat, though). After she told me this, I gave her some advice on how to try and become closer friends with him, and she took it and now they talk more often than before.

However, at some point after she told me, I ended up developing feelings for him as well. I tried to deny these feelings to myself for a while because they made me feel like a bad friend, but the 3 of us, along with some other friends, hung out all day the other day and seeing her continuously try to spend time with him was hard enough for me that I realized I actually do have feelings for him. Unfortunately, I'm always the one she comes to when she wants to gush about him and report anything new, which obviously upsets me but I have to keep acting like I'm happy for her because I can't tell her the truth.

There's also some part of me that feels like he and I are more compatible because we share the same sense of humor and have more similar interests, whereas she doesn't have too much in common with him as far as I can tell. I guess I would just like some advice on what exactly I should do. I haven't told anyone in real life because, again, I feel like a bad friend for "stealing" my friend's crush, especially since I started liking him after she told me she likes him. In my opinion, I don't think that he views either of us as more than a friend, but there are some moments where I can't tell if he's joking around or trying to flirt in a very lowkey way. What should I do if he ends up telling me he likes me or something? I feel like it would be bad of me to go for it because she clearly established that she liked him first, but I don't know anymore. What do you think?

tl;dr: My friend told me she likes one of our mutual friends and now I like him too but feel like a bad friend for it