Tell my boyfriend I'm bi??😰

Soo it's recently becoming really apparent to me that I would love to experiment with girls..and that I'm probably bi or somewhere on that spectrum. Is this something I tell my boyfriend of 1 year? I'm afraid he'll think differently of me, maybe not in a bad way.but still it's sort of scary. He knows EVERYTHING about me except this. On the other hand, what would I be accomplishing in telling him? Help 😞