Both the extra love interests are boys! Our Life: Beginnings & Always is being made for those who wanna befriend/date dudes specifically. That's because it would've been kind of lame of us to have just one female side option in a game that clearly prioritizes the male lead, Cove, so we didn't do it. Instead we're planning on making Our Life: Now & Forever, which will be a new game that has the same type of features but focuses on female and non-binary options specifically.
And, as the other commenter said, Elizabeth is the MC's sibling. She definitely is very pretty and cool when seen in screenshots, so I understand the interest. But because of her actual role in the game we couldn't have made her a romance option even if there were girl romances in OL: B&A. I'm sorry for that.