Confused Bout My Crush

Here's the situation: my friend who is also my roomate has crush on 4 different guys. And o never liked any of them before. But now I have a crush on one of the guy and he also likes me back. But I don't want tk betray her. I feel guilty. But it's the first time someone genuinely liked me. That guy is also my neighbor. And the thing is he will not confess otherwise it will be awkward because our rooms are next to each other. I want to like him but my guilt won't let me. And that guy will not confess. I just know because I overheard his conversation with his fried. Idk what to do. But i really falling for him now.