a member

So me and my best friend have been friends for about 4 years now. And the thing is, I think I might have feelings for him. But we have agreed in the past that we would just be better off as friends because we like to 'fake flirt' a lot. My mom already thinks we are dating and thats why we had to clarify that we'd be better as friends. Another thing though is that we agreed that we said we would help eachother learn how to like kiss. So that got me more confused and it made me like him even more. He is trans btw (ftm) and I am a girl. We both haven't really ever been in relationships either. So should I tell him this or keep it to myself to not ruin the friendship?