Iris phrases is awkwardly, but “being a man” isn’t an option for Blake anymore, and she knows that. What she talks about is staying true to his initial personality that she likes. Which means you shouldn’t follow the bimbo route, if you want her to stay faithful to you.
Cheating on her is any sexual contact you’ve had after joining her route, except Trish’s offer, and any porn scenes Blake is going to do, but only with men.
Yes, she naturally will get more content, since she has a route
Blake is cautious to visit Iris, because it’s a little dangerous for him. At her job and school there’s Stewart, who disapproves of their relationship, and at home she has Vanessa, and things are complicated with her.