Best friend help

My best friend whom I've known since 6th grade, now in 8th, told me she was bi and that she liked me this past summer.

I myself am bi also, but my parents are Christian and when I bring up the smallest thing about gay or lesbian couples she says they are not following the lord n rambles about all that other religious shiz, so I told her I feel the same way, but we couldn't. Now she has a boyfriend but I think she still likes me, and I don't know what to say. I'm planning on possibly telling my mom sometime in April when I have an art show, with a self portrait I am working on, so maybe I'll tell her then. But my bff and her bf are really cute together and this is one of her longest relationships so I don't want to ruin it... what do I do?

I still like her, a little bit romantically, but mostly just as a friend.