need advice :)

so recently i've been hanging around these people who i'll call a, b, c, d.

recently, i got a lot closer to a and, because of that, also b, c, and d. i got the feeling a couple days ago that b likes me (and i sort of like him back), but i never told anybody, i kept it to myself.

the problem is that d asked a privately if i liked b, and a said no because she didn't know that i did. i think that d told b that a said i didn't like him, and now b seems really upset with me.

i'm planning on asking him if he's upset and why, but i don't think that's going to fix anything. i at least want him to feel comfortable with me because he's really really comfortable with a (they call for like hours in the evening, they tell each other about their love lives, they text a ton) and it makes me sad because i didn't mean for that to happen.

i don't want to tell him that i like him because he might not. a mentioned that he liked other girls, and even had his eye on one specific girl. but i feel like that's the only possible reason he doesn't want to talk to me because everything was fine before that.

i just don't know what to do - these are my only friends at my school + i don't want to lose what we have because it's going to be awkward + because they're good people.

thanks! :)