Your relationship with bumblebee had to be kept top secret, not even shared with your close friends who also knew about the autobots.

A Cybertronian/human relationship would be the first of its kind (that you had heard of at least) and draw lots of unwekcome attention, especially fron decepticons. Even if it broke your boyfriends little spark to only be able to love you in private.

Through the language barrier and through the species difference, you had fallen in love with and gotten to know a lovely and affectionate mech. He adored you. Loving your spikey and black clothing, the way you adorened yourself with so many accessories, it fascinated him.

Humans wera source of curiosity to Bumblebee, and you were a source of unyielding love. He just wished it was unapologetic too.