The MC isn’t forced to like Breden. She’s attractive, and starts the game interested in you; but you can have a wide range of responses to her, many of which will quickly put the relationship into collegial or hostile territory.
And yes, a non-bi MC has Breden or no one in Game 1. (Unless, as Taylor says, you interpret the initial “you couldn’t help noticing how attractive s/he was” as, for example, the way I inevitably recognize Channing Tatum as an attractive guy despite being straight myself). Other ROs will pop up in Game 2.
You’re entitled to gripe.
It’s no trouble to ask – but answering would be spoilers. 