My girlfriends boyfriend

I’m just gonna start by saying this is gonna sound a little insane but bear with me. So I’m 14 and I recently (a few weeks ago) came out as bisexual to my best friends boyfriend (who is the only guy/person I trust). He was very supportive and wanted me to tell my best friend because he knew she would be supportive and I also like her. So I told her and a few really close friends and everyone was very supportive. So my best friend and her boyfriend, we’ll call them Ana and Jack, both knew that I liked Ana and they talked about it and we’re both wanted me and Ana to date but while they kept dating. So Ana asked me out and I said yes and we’ve been dating for almost 3 weeks now, but me and Jack are attracted to eachother. We’ve also been sending eachother nudes and he’s grabbed my ass and put his hand down the back and front of my pants and fingered me. So Ana knows that me and Jack like eachother but she obviously doesn’t know what we’ve done. But now I’m not really sure on what to do. I love them both and they love eachother but we’re also 14/15 and I feel like this is way too complicated for us right now. Also none of our parents know. Their parents know that they are dating but that’s it. My parents wouldn’t approve of me being bi or me sending what I’ve been sending. Anyone have any advice? I know it’s a weird situation but I don’t know what to do

UPDATE: we have talked about an open relationship. Ana said she wanted us to be a little more comfortable in our relationship before we tried to bring Jack in. But all three of us have been attracted to eachother basically since we met, they were just dating before I met them. Jack and I aren’t trying to hide everything from her we just aren’t sure how to bring it up because she’s been thinking about how a relationship would work with all three of us. We all love eachother and want to be with eachother. Also with the whole nudes thing I’d trust Jack with my life. He’s always very considerate and I send them on Snapchat and he never screenshots and I’ve seen his phone so I know he hasn’t kept them in any way at least on his phone. And he’s not just “someone else’s boyfriend” he’s my girlfriends boyfriend and she knows he’s sent me things and that I’ve sent him pics of me in my bra she just doesn’t know that I took my bra off at one point... (also of y’all could upvote this so I could get more people’s opinions that would be highly appreciated)